391972998 has 16 divisors (see below), whose sum is σ = 784347696. Its totient is φ = 130590720.

The previous prime is 391972979. The next prime is 391973009. The reversal of 391972998 is 899279193.

It is a super-2 number, since 2×391972998² = 307285662322216008, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3211 + ... + 28182.

It is an arithmetic number, because the mean of its divisors is an integer number (49021731).

Almost surely, 2^391972998 is an apocalyptic number.

391972998 is an abundant number, since it is smaller than the sum of its proper divisors (392374698).

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

391972998 is a wasteful number, since it uses less digits than its factorization.

391972998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33479.

The product of its digits is 2204496, while the sum is 57.

The square root of 391972998 is about 19798.3079580049. The cubic root of 391972998 is about 731.8443374397.

It can be divided in two parts, 39197 and 2998, that added together give a triangular number (42195 = T₂₉₀).

The spelling of 391972998 in words is "three hundred ninety-one million, nine hundred seventy-two thousand, nine hundred ninety-eight".