400078990 has 8 divisors (see below), whose sum is σ = 720142200. Its totient is φ = 160031592.

The previous prime is 400078981. The next prime is 400079011. The reversal of 400078990 is 99870004.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20003940 + ... + 20003959.

It is an arithmetic number, because the mean of its divisors is an integer number (90017775).

Almost surely, 2^400078990 is an apocalyptic number.

400078990 is a deficient number, since it is larger than the sum of its proper divisors (320063210).

400078990 is a wasteful number, since it uses less digits than its factorization.

400078990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40007906.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 400078990 is about 20001.9746525187. The cubic root of 400078990 is about 736.8547968106.

The spelling of 400078990 in words is "four hundred million, seventy-eight thousand, nine hundred ninety".