1397434256 has 20 divisors (see below), whose sum is σ = 2721563532. Its totient is φ = 695095296.

The previous prime is 1397434243. The next prime is 1397434267. The reversal of 1397434256 is 6524347931.

It can be written as a sum of positive squares in 2 ways, for example, as 746163856 + 651270400 = 27316^2 + 25520^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 223181 + ... + 229356.

Almost surely, 2^1397434256 is an apocalyptic number.

1397434256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1397434256 is a deficient number, since it is larger than the sum of its proper divisors (1324129276).

1397434256 is a wasteful number, since it uses less digits than its factorization.

1397434256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452738 (or 452732 counting only the distinct ones).

The product of its digits is 544320, while the sum is 44.

The square root of 1397434256 is about 37382.2719480772. The cubic root of 1397434256 is about 1118.0051266882.

The spelling of 1397434256 in words is "one billion, three hundred ninety-seven million, four hundred thirty-four thousand, two hundred fifty-six".