400550979 has 8 divisors (see below), whose sum is σ = 534384832. Its totient is φ = 266875560.

The previous prime is 400550947. The next prime is 400550993. The reversal of 400550979 is 979055004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 400550979 - 2⁵ = 400550947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400551979) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 33577 + ... + 43914.

It is an arithmetic number, because the mean of its divisors is an integer number (66798104).

Almost surely, 2^400550979 is an apocalyptic number.

400550979 is a deficient number, since it is larger than the sum of its proper divisors (133833853).

400550979 is a wasteful number, since it uses less digits than its factorization.

400550979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79217.

The product of its (nonzero) digits is 56700, while the sum is 39.

The square root of 400550979 is about 20013.7697348600. The cubic root of 400550979 is about 737.1444485134.

The spelling of 400550979 in words is "four hundred million, five hundred fifty thousand, nine hundred seventy-nine".