394986690 has 48 divisors (see below), whose sum is σ = 1173676608. Its totient is φ = 90282528.

The previous prime is 394986673. The next prime is 394986701. The reversal of 394986690 is 96689493.

It is a happy number.

394986690 is a `hidden beast` number, since 3 + 9 + 498 + 66 + 90 = 666.

It is a super-2 number, since 2×394986690² = 312028970554312200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 312852 + ... + 314111.

It is an arithmetic number, because the mean of its divisors is an integer number (24451596).

Almost surely, 2^394986690 is an apocalyptic number.

394986690 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

394986690 is an abundant number, since it is smaller than the sum of its proper divisors (778689918).

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

394986690 is a wasteful number, since it uses less digits than its factorization.

394986690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626983 (or 626980 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 54.

The square root of 394986690 is about 19874.2720621410. The cubic root of 394986690 is about 733.7151508010.

The spelling of 394986690 in words is "three hundred ninety-four million, nine hundred eighty-six thousand, six hundred ninety".