1256265136 has 30 divisors (see below), whose sum is σ = 2831405460. Its totient is φ = 538399008.

The previous prime is 1256265113. The next prime is 1256265137. The reversal of 1256265136 is 6315626521.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1256265095 and 1256265104.

It is not an unprimeable number, because it can be changed into a prime (1256265137) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 800406 + ... + 801973.

It is an arithmetic number, because the mean of its divisors is an integer number (94380182).

Almost surely, 2^1256265136 is an apocalyptic number.

1256265136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1256265136 is an abundant number, since it is smaller than the sum of its proper divisors (1575140324).

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

1256265136 is a wasteful number, since it uses less digits than its factorization.

1256265136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1602401 (or 1602388 counting only the distinct ones).

The product of its digits is 64800, while the sum is 37.

The square root of 1256265136 is about 35443.8307184762. The cubic root of 1256265136 is about 1079.0140567575.

The spelling of 1256265136 in words is "one billion, two hundred fifty-six million, two hundred sixty-five thousand, one hundred thirty-six".