400004664 has 32 divisors (see below), whose sum is σ = 1001293440. Its totient is φ = 133164000.

The previous prime is 400004653. The next prime is 400004783. The reversal of 400004664 is 466400004.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 9189 + ... + 29739.

It is an arithmetic number, because the mean of its divisors is an integer number (31290420).

Almost surely, 2^400004664 is an apocalyptic number.

It is an amenable number.

400004664 is an abundant number, since it is smaller than the sum of its proper divisors (601288776).

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

400004664 is a wasteful number, since it uses less digits than its factorization.

400004664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21371 (or 21367 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 400004664 is about 20000.1165996601. The cubic root of 400004664 is about 736.8091634374.

Adding to 400004664 its reverse (466400004), we get a palindrome (866404668).

The spelling of 400004664 in words is "four hundred million, four thousand, six hundred sixty-four".