1259949720 has 128 divisors (see below), whose sum is σ = 3864672000. Its totient is φ = 328512000.

The previous prime is 1259949707. The next prime is 1259949737. The reversal of 1259949720 is 279499521.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1259949720.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1776726 + ... + 1777434.

It is an arithmetic number, because the mean of its divisors is an integer number (30192750).

Almost surely, 2^1259949720 is an apocalyptic number.

1259949720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1259949720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1932336000).

1259949720 is an abundant number, since it is smaller than the sum of its proper divisors (2604722280).

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

1259949720 is a wasteful number, since it uses less digits than its factorization.

1259949720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033 (or 1029 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 48.

The square root of 1259949720 is about 35495.7704522666. The cubic root of 1259949720 is about 1080.0679312552.

The spelling of 1259949720 in words is "one billion, two hundred fifty-nine million, nine hundred forty-nine thousand, seven hundred twenty".