398961690 has 16 divisors (see below), whose sum is σ = 957508128. Its totient is φ = 106389776.

The previous prime is 398961683. The next prime is 398961707. The reversal of 398961690 is 96169893.

It is a super-2 number, since 2×398961690² = 318340860175312200, 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, 6649332 + ... + 6649391.

It is an arithmetic number, because the mean of its divisors is an integer number (59844258).

Almost surely, 2^398961690 is an apocalyptic number.

398961690 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

398961690 is an abundant number, since it is smaller than the sum of its proper divisors (558546438).

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

398961690 is a wasteful number, since it uses less digits than its factorization.

398961690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13298733.

The product of its (nonzero) digits is 629856, while the sum is 51.

The square root of 398961690 is about 19974.0253829818. The cubic root of 398961690 is about 736.1682195141.

The spelling of 398961690 in words is "three hundred ninety-eight million, nine hundred sixty-one thousand, six hundred ninety".