400633646 has 32 divisors (see below), whose sum is σ = 712777728. Its totient is φ = 165265920.

The previous prime is 400633643. The next prime is 400633657. The reversal of 400633646 is 646336004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400633643) 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 in 15 ways as a sum of consecutive naturals, for example, 81371 + ... + 86153.

It is an arithmetic number, because the mean of its divisors is an integer number (22274304).

Almost surely, 2^400633646 is an apocalyptic number.

400633646 is a deficient number, since it is larger than the sum of its proper divisors (312144082).

400633646 is a wasteful number, since it uses less digits than its factorization.

400633646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5016.

The product of its (nonzero) digits is 31104, while the sum is 32.

The square root of 400633646 is about 20015.8348814133. The cubic root of 400633646 is about 737.1951564396.

The spelling of 400633646 in words is "four hundred million, six hundred thirty-three thousand, six hundred forty-six".