400985646 has 16 divisors (see below), whose sum is σ = 802174800. Its totient is φ = 133627968.

The previous prime is 400985567. The next prime is 400985701. The reversal of 400985646 is 646589004.

It is a junction number, because it is equal to n+sod(n) for n = 400985598 and 400985607.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 32010 + ... + 42738.

It is an arithmetic number, because the mean of its divisors is an integer number (50135925).

Almost surely, 2^400985646 is an apocalyptic number.

400985646 is an abundant number, since it is smaller than the sum of its proper divisors (401189154).

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

400985646 is a wasteful number, since it uses less digits than its factorization.

400985646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16963.

The product of its (nonzero) digits is 207360, while the sum is 42.

The square root of 400985646 is about 20024.6259890166. The cubic root of 400985646 is about 737.4109951385.

The spelling of 400985646 in words is "four hundred million, nine hundred eighty-five thousand, six hundred forty-six".