400329856 has 16 divisors (see below), whose sum is σ = 797532390. Its totient is φ = 200164864.

The previous prime is 400329851. The next prime is 400329857. The reversal of 400329856 is 658923004.

It can be written as a sum of positive squares in only one way, i.e., 388878400 + 11451456 = 19720^2 + 3384^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is not an unprimeable number, because it can be changed into a prime (400329851) 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 as a sum of consecutive naturals, namely, 1563661 + ... + 1563916.

Almost surely, 2^400329856 is an apocalyptic number.

It is an amenable number.

400329856 is a deficient number, since it is larger than the sum of its proper divisors (397202534).

400329856 is an equidigital number, since it uses as much as digits as its factorization.

400329856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3127591 (or 3127579 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 400329856 is about 20008.2447006228. The cubic root of 400329856 is about 737.0087773969.

The spelling of 400329856 in words is "four hundred million, three hundred twenty-nine thousand, eight hundred fifty-six".