400401328 has 10 divisors (see below), whose sum is σ = 775777604. Its totient is φ = 200200656.

The previous prime is 400401311. The next prime is 400401329. The reversal of 400401328 is 823104004.

It is a junction number, because it is equal to n+sod(n) for n = 400401299 and 400401308.

It is not an unprimeable number, because it can be changed into a prime (400401329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12512526 + ... + 12512557.

Almost surely, 2^400401328 is an apocalyptic number.

It is an amenable number.

400401328 is a deficient number, since it is larger than the sum of its proper divisors (375376276).

400401328 is a wasteful number, since it uses less digits than its factorization.

400401328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25025091 (or 25025085 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 400401328 is about 20010.0306846341. The cubic root of 400401328 is about 737.0526348610.

The spelling of 400401328 in words is "four hundred million, four hundred one thousand, three hundred twenty-eight".