398031990 has 32 divisors (see below), whose sum is σ = 955846656. Its totient is φ = 106078560.

The previous prime is 398031979. The next prime is 398032009. The reversal of 398031990 is 99130893.

It is a happy number.

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 15 ways as a sum of consecutive naturals, for example, 69579 + ... + 75081.

It is an arithmetic number, because the mean of its divisors is an integer number (29870208).

Almost surely, 2^398031990 is an apocalyptic number.

398031990 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

398031990 is an abundant number, since it is smaller than the sum of its proper divisors (557814666).

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

398031990 is a wasteful number, since it uses less digits than its factorization.

398031990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7924.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 398031990 is about 19950.7390840540. The cubic root of 398031990 is about 735.5959440875.

The spelling of 398031990 in words is "three hundred ninety-eight million, thirty-one thousand, nine hundred ninety".