1256918472 has 56 divisors (see below), whose sum is σ = 3533483190. Its totient is φ = 418970880.

The previous prime is 1256918471. The next prime is 1256918491. The reversal of 1256918472 is 2748196521.

1256918472 is a `hidden beast` number, since 1 + 2 + 569 + 1 + 84 + 7 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 669049956 + 587868516 = 25866^2 + 24246^2 .

It is not an unprimeable number, because it can be changed into a prime (1256918471) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 101929 + ... + 113592.

Almost surely, 2^1256918472 is an apocalyptic number.

1256918472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1256918472 is an abundant number, since it is smaller than the sum of its proper divisors (2276564718).

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

1256918472 is an equidigital number, since it uses as much as digits as its factorization.

1256918472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215545 (or 215526 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 1256918472 is about 35453.0460186427. The cubic root of 1256918472 is about 1079.2010758125.

The spelling of 1256918472 in words is "one billion, two hundred fifty-six million, nine hundred eighteen thousand, four hundred seventy-two".