400199990 has 16 divisors (see below), whose sum is σ = 720906480. Its totient is φ = 159958560.

The previous prime is 400199959. The next prime is 400199993. The reversal of 400199990 is 99991004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400199993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 680 + ... + 28299.

It is an arithmetic number, because the mean of its divisors is an integer number (45056655).

Almost surely, 2^400199990 is an apocalyptic number.

400199990 is a deficient number, since it is larger than the sum of its proper divisors (320706490).

400199990 is a wasteful number, since it uses less digits than its factorization.

400199990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30367.

The product of its (nonzero) digits is 26244, while the sum is 41.

The square root of 400199990 is about 20004.9991252187. Note that the first 3 decimals coincide. The cubic root of 400199990 is about 736.9290741789.

The spelling of 400199990 in words is "four hundred million, one hundred ninety-nine thousand, nine hundred ninety".