400500664 has 8 divisors (see below), whose sum is σ = 750938760. Its totient is φ = 200250328.

The previous prime is 400500649. The next prime is 400500689. The reversal of 400500664 is 466005004.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25031284 + ... + 25031299.

It is an arithmetic number, because the mean of its divisors is an integer number (93867345).

Almost surely, 2^400500664 is an apocalyptic number.

It is an amenable number.

400500664 is a deficient number, since it is larger than the sum of its proper divisors (350438096).

400500664 is a wasteful number, since it uses less digits than its factorization.

400500664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50062589 (or 50062585 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 400500664 is about 20012.5126858173. The cubic root of 400500664 is about 737.1135818838.

Adding to 400500664 its reverse (466005004), we get a palindrome (866505668).

The spelling of 400500664 in words is "four hundred million, five hundred thousand, six hundred sixty-four".