400638396 has 48 divisors (see below), whose sum is σ = 960358784. Its totient is φ = 129923136.

The previous prime is 400638383. The next prime is 400638401. The reversal of 400638396 is 693836004.

It is a super-2 number, since 2×400638396² = 321022248698905632, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141531 + ... + 144333.

Almost surely, 2^400638396 is an apocalyptic number.

It is an amenable number.

400638396 is an abundant number, since it is smaller than the sum of its proper divisors (559720388).

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

400638396 is a wasteful number, since it uses less digits than its factorization.

400638396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3130 (or 3128 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 39.

The square root of 400638396 is about 20015.9535371163. The cubic root of 400638396 is about 737.1980698770.

The spelling of 400638396 in words is "four hundred million, six hundred thirty-eight thousand, three hundred ninety-six".