400956893938 has 16 divisors (see below), whose sum is σ = 602567878680. Its totient is φ = 200101262976.

The previous prime is 400956893899. The next prime is 400956893957. The reversal of 400956893938 is 839398659004.

It can be written as a sum of positive squares in 4 ways, for example, as 392060065609 + 8896828329 = 626147^2 + 94323^2 .

It is a super-2 number, since 2×400956893938² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 400956893938.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2394406 + ... + 2556382.

Almost surely, 2^400956893938 is an apocalyptic number.

400956893938 is a deficient number, since it is larger than the sum of its proper divisors (201610984742).

400956893938 is a wasteful number, since it uses less digits than its factorization.

400956893938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164301.

The product of its (nonzero) digits is 50388480, while the sum is 64.

The spelling of 400956893938 in words is "four hundred billion, nine hundred fifty-six million, eight hundred ninety-three thousand, nine hundred thirty-eight".