1256401572 has 12 divisors (see below), whose sum is σ = 2931603696. Its totient is φ = 418800520.

The previous prime is 1256401561. The next prime is 1256401577. The reversal of 1256401572 is 2751046521.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (1256401577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52350054 + ... + 52350077.

It is an arithmetic number, because the mean of its divisors is an integer number (244300308).

Almost surely, 2^1256401572 is an apocalyptic number.

1256401572 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1256401572 is an abundant number, since it is smaller than the sum of its proper divisors (1675202124).

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

1256401572 is a wasteful number, since it uses less digits than its factorization.

1256401572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104700138 (or 104700136 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 1256401572 is about 35445.7553453160. The cubic root of 1256401572 is about 1079.0531172575.

The spelling of 1256401572 in words is "one billion, two hundred fifty-six million, four hundred one thousand, five hundred seventy-two".