1256984730 has 160 divisors (see below), whose sum is σ = 3564950400. Its totient is φ = 317167488.

The previous prime is 1256984723. The next prime is 1256984741. The reversal of 1256984730 is 374896521.

1256984730 is a `hidden beast` number, since 1 + 2 + 569 + 84 + 7 + 3 + 0 = 666.

1256984730 is digitally balanced in base 10, because in such base it contains all the possibile digits an equal number of times.

1256984730 is a nontrivial binomial coefficient, being equal to C(50140, 2).

It is a super-2 number, since 2×1256984730² = 3160021222906345800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

1256984730 is strictly pandigital in base 10.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2030361 + ... + 2030979.

It is an arithmetic number, because the mean of its divisors is an integer number (22280940).

It is a 1-persistent number, because it is pandigital, but 2⋅1256984730 = 2513969460 is not.

Almost surely, 2^1256984730 is an apocalyptic number.

1256984730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1256984730 is the 50139-th triangular number and also the 25070-th hexagonal number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1256984730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1782475200).

1256984730 is an abundant number, since it is smaller than the sum of its proper divisors (2307965670).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1256984730 is a wasteful number, since it uses less digits than its factorization.

1256984730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770 (or 761 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 1256984730 is about 35453.9804535401. The cubic root of 1256984730 is about 1079.2200387100.

The spelling of 1256984730 in words is "one billion, two hundred fifty-six million, nine hundred eighty-four thousand, seven hundred thirty".