398608686 has 24 divisors (see below), whose sum is σ = 987031344. Its totient is φ = 113888160.

The previous prime is 398608681. The next prime is 398608687. The reversal of 398608686 is 686806893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398608681) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1581655 + ... + 1581906.

It is an arithmetic number, because the mean of its divisors is an integer number (41126306).

Almost surely, 2^398608686 is an apocalyptic number.

398608686 is an abundant number, since it is smaller than the sum of its proper divisors (588422658).

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

398608686 is a wasteful number, since it uses less digits than its factorization.

398608686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3163576 (or 3163573 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 54.

The square root of 398608686 is about 19965.1868511166. The cubic root of 398608686 is about 735.9510332400.

The spelling of 398608686 in words is "three hundred ninety-eight million, six hundred eight thousand, six hundred eighty-six".