400688488 has 8 divisors (see below), whose sum is σ = 751290930. Its totient is φ = 200344240.

The previous prime is 400688479. The next prime is 400688501. The reversal of 400688488 is 884886004.

It can be written as a sum of positive squares in only one way, i.e., 357890724 + 42797764 = 18918^2 + 6542^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×400688488² = 321102528831452288, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25043023 + ... + 25043038.

Almost surely, 2^400688488 is an apocalyptic number.

It is an amenable number.

400688488 is a deficient number, since it is larger than the sum of its proper divisors (350602442).

400688488 is a wasteful number, since it uses less digits than its factorization.

400688488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50086067 (or 50086063 counting only the distinct ones).

The product of its (nonzero) digits is 393216, while the sum is 46.

The square root of 400688488 is about 20017.2047998715. The cubic root of 400688488 is about 737.2287926660.

The spelling of 400688488 in words is "four hundred million, six hundred eighty-eight thousand, four hundred eighty-eight".