398866239 has 12 divisors (see below), whose sum is σ = 576466176. Its totient is φ = 265760352.

The previous prime is 398866187. The next prime is 398866241. The reversal of 398866239 is 932668893.

398866239 is a `hidden beast` number, since 3 + 9 + 8 + 8 + 6 + 623 + 9 = 666.

It is not a de Polignac number, because 398866239 - 2¹⁷ = 398735167 is a prime.

It is a super-2 number, since 2×398866239² = 318188553228010242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398866249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5634 + ... + 28800.

It is an arithmetic number, because the mean of its divisors is an integer number (48038848).

Almost surely, 2^398866239 is an apocalyptic number.

398866239 is a deficient number, since it is larger than the sum of its proper divisors (177599937).

398866239 is a wasteful number, since it uses less digits than its factorization.

398866239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25086 (or 25083 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 54.

The square root of 398866239 is about 19971.6358618917. The cubic root of 398866239 is about 736.1095057753.

The spelling of 398866239 in words is "three hundred ninety-eight million, eight hundred sixty-six thousand, two hundred thirty-nine".