400137608 has 16 divisors (see below), whose sum is σ = 807970380. Its totient is φ = 184678848.

The previous prime is 400137571. The next prime is 400137623. The reversal of 400137608 is 806731004.

It can be written as a sum of positive squares in 2 ways, for example, as 305620324 + 94517284 = 17482^2 + 9722^2 .

It is a super-2 number, since 2×400137608² = 320220210671923328, which contains 22 as substring.

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, 1923635 + ... + 1923842.

Almost surely, 2^400137608 is an apocalyptic number.

It is an amenable number.

400137608 is an abundant number, since it is smaller than the sum of its proper divisors (407832772).

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

400137608 is a wasteful number, since it uses less digits than its factorization.

400137608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3847496 (or 3847492 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 400137608 is about 20003.4399041765. The cubic root of 400137608 is about 736.8907820754.

The spelling of 400137608 in words is "four hundred million, one hundred thirty-seven thousand, six hundred eight".