398921976 has 32 divisors (see below), whose sum is σ = 1108117200. Its totient is φ = 132973920.

The previous prime is 398921933. The next prime is 398921977. The reversal of 398921976 is 679129893.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398921977) 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, 923215 + ... + 923646.

Almost surely, 2^398921976 is an apocalyptic number.

398921976 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

398921976 is an abundant number, since it is smaller than the sum of its proper divisors (709195224).

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

398921976 is a wasteful number, since it uses less digits than its factorization.

398921976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1846876 (or 1846866 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 54.

The square root of 398921976 is about 19973.0312171187. The cubic root of 398921976 is about 736.1437918096.

The spelling of 398921976 in words is "three hundred ninety-eight million, nine hundred twenty-one thousand, nine hundred seventy-six".