398932018 has 8 divisors (see below), whose sum is σ = 629892720. Its totient is φ = 188967780.

The previous prime is 398931991. The next prime is 398932063. The reversal of 398932018 is 810239893.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5249068 + ... + 5249143.

It is an arithmetic number, because the mean of its divisors is an integer number (78736590).

Almost surely, 2^398932018 is an apocalyptic number.

398932018 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

398932018 is a deficient number, since it is larger than the sum of its proper divisors (230960702).

398932018 is a wasteful number, since it uses less digits than its factorization.

398932018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10498232.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 398932018 is about 19973.2826045195. The cubic root of 398932018 is about 736.1499687016.

The spelling of 398932018 in words is "three hundred ninety-eight million, nine hundred thirty-two thousand, eighteen".