1256040634 has 16 divisors (see below), whose sum is σ = 1950366600. Its totient is φ = 605948224.

The previous prime is 1256040601. The next prime is 1256040637. The reversal of 1256040634 is 4360406521.

It can be written as a sum of positive squares in 4 ways, for example, as 1138860009 + 117180625 = 33747^2 + 10825^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1256040596 and 1256040605.

It is not an unprimeable number, because it can be changed into a prime (1256040637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88332 + ... + 101560.

Almost surely, 2^1256040634 is an apocalyptic number.

1256040634 is a deficient number, since it is larger than the sum of its proper divisors (694325966).

1256040634 is a wasteful number, since it uses less digits than its factorization.

1256040634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14897.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 1256040634 is about 35440.6635660226. The cubic root of 1256040634 is about 1078.9497775333.

The spelling of 1256040634 in words is "one billion, two hundred fifty-six million, forty thousand, six hundred thirty-four".