400399992 has 48 divisors (see below), whose sum is σ = 1094572440. Its totient is φ = 132216768.

The previous prime is 400399949. The next prime is 400400041. The reversal of 400399992 is 299993004.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

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 in 11 ways as a sum of consecutive naturals, for example, 18283 + ... + 33690.

Almost surely, 2^400399992 is an apocalyptic number.

It is an amenable number.

400399992 is an abundant number, since it is smaller than the sum of its proper divisors (694172448).

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

400399992 is a wasteful number, since it uses less digits than its factorization.

400399992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52092 (or 52085 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 45.

The square root of 400399992 is about 20009.9973013491. The cubic root of 400399992 is about 737.0518150973.

The spelling of 400399992 in words is "four hundred million, three hundred ninety-nine thousand, nine hundred ninety-two".