1256944406 has 32 divisors (see below), whose sum is σ = 1967874048. Its totient is φ = 601691040.

The previous prime is 1256944399. The next prime is 1256944433. The reversal of 1256944406 is 6044496521.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1278191 + ... + 1279173.

It is an arithmetic number, because the mean of its divisors is an integer number (61496064).

Almost surely, 2^1256944406 is an apocalyptic number.

1256944406 is a deficient number, since it is larger than the sum of its proper divisors (710929642).

1256944406 is a wasteful number, since it uses less digits than its factorization.

1256944406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1316.

The product of its (nonzero) digits is 207360, while the sum is 41.

The square root of 1256944406 is about 35453.4117681218. The cubic root of 1256944406 is about 1079.2084981471.

The spelling of 1256944406 in words is "one billion, two hundred fifty-six million, nine hundred forty-four thousand, four hundred six".