400632388 has 24 divisors (see below), whose sum is σ = 760562712. Its totient is φ = 183554304.

The previous prime is 400632367. The next prime is 400632389. The reversal of 400632388 is 883236004.

It can be written as a sum of positive squares in 4 ways, for example, as 27060804 + 373571584 = 5202^2 + 19328^2 .

It is not an unprimeable number, because it can be changed into a prime (400632389) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 20995 + ... + 35242.

It is an arithmetic number, because the mean of its divisors is an integer number (31690113).

Almost surely, 2^400632388 is an apocalyptic number.

It is an amenable number.

400632388 is a deficient number, since it is larger than the sum of its proper divisors (359930324).

400632388 is a wasteful number, since it uses less digits than its factorization.

400632388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56391 (or 56389 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 400632388 is about 20015.8034562692. The cubic root of 400632388 is about 737.1943848348.

The spelling of 400632388 in words is "four hundred million, six hundred thirty-two thousand, three hundred eighty-eight".