398735986 has 16 divisors (see below), whose sum is σ = 690858720. Its totient is φ = 170582080.

The previous prime is 398735977. The next prime is 398736017. The reversal of 398735986 is 689537893.

It is a self number, because there is not a number n which added to its sum of digits gives 398735986.

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, 532696 + ... + 533443.

It is an arithmetic number, because the mean of its divisors is an integer number (43178670).

Almost surely, 2^398735986 is an apocalyptic number.

398735986 is a deficient number, since it is larger than the sum of its proper divisors (292122734).

398735986 is a wasteful number, since it uses less digits than its factorization.

398735986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1066169.

The product of its digits is 9797760, while the sum is 58.

The square root of 398735986 is about 19968.3746459245. The cubic root of 398735986 is about 736.0293695452.

The spelling of 398735986 in words is "three hundred ninety-eight million, seven hundred thirty-five thousand, nine hundred eighty-six".