390942018 has 16 divisors (see below), whose sum is σ = 868760160. Its totient is φ = 130313988.

The previous prime is 390942001. The next prime is 390942029. The reversal of 390942018 is 810249093.

It is a super-2 number, since 2×390942018² = 305671322875824648, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3619780 + ... + 3619887.

It is an arithmetic number, because the mean of its divisors is an integer number (54297510).

Almost surely, 2^390942018 is an apocalyptic number.

390942018 is an abundant number, since it is smaller than the sum of its proper divisors (477818142).

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

390942018 is a wasteful number, since it uses less digits than its factorization.

390942018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7239678 (or 7239672 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 390942018 is about 19772.2537410382. The cubic root of 390942018 is about 731.2021338820.

The spelling of 390942018 in words is "three hundred ninety million, nine hundred forty-two thousand, eighteen".