400672666 has 16 divisors (see below), whose sum is σ = 606957120. Its totient is φ = 198361440.

The previous prime is 400672661. The next prime is 400672669. The reversal of 400672666 is 666276004.

It is not an unprimeable number, because it can be changed into a prime (400672661) 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 7 ways as a sum of consecutive naturals, for example, 118621 + ... + 121951.

It is an arithmetic number, because the mean of its divisors is an integer number (37934820).

Almost surely, 2^400672666 is an apocalyptic number.

400672666 is a deficient number, since it is larger than the sum of its proper divisors (206284454).

400672666 is a wasteful number, since it uses less digits than its factorization.

400672666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3909.

The product of its (nonzero) digits is 72576, while the sum is 37.

The square root of 400672666 is about 20016.8095859455. The cubic root of 400672666 is about 737.2190888788.

The spelling of 400672666 in words is "four hundred million, six hundred seventy-two thousand, six hundred sixty-six".