1240256844 has 72 divisors (see below), whose sum is σ = 3307362240. Its totient is φ = 390798432.

The previous prime is 1240256837. The next prime is 1240256867. The reversal of 1240256844 is 4486520421.

1240256844 is a `hidden beast` number, since 12 + 40 + 2 + 568 + 44 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1240256799 and 1240256808.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 355999 + ... + 359465.

Almost surely, 2^1240256844 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1240256844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1653681120).

1240256844 is an abundant number, since it is smaller than the sum of its proper divisors (2067105396).

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

1240256844 is a wasteful number, since it uses less digits than its factorization.

1240256844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4019 (or 4014 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 36.

The square root of 1240256844 is about 35217.2804742217. The cubic root of 1240256844 is about 1074.4112424892.

It can be divided in two parts, 1240256 and 844, that added together give a triangular number (1241100 = T₁₅₇₅).

The spelling of 1240256844 in words is "one billion, two hundred forty million, two hundred fifty-six thousand, eight hundred forty-four".