398899187 has 2 divisors, whose sum is σ = 398899188. Its totient is φ = 398899186.

The previous prime is 398899181. The next prime is 398899217. The reversal of 398899187 is 781998893.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 398899187 - 2²⁰ = 397850611 is a prime.

It is a super-2 number, since 2×398899187² = 318241122778521938, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (398899181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199449593 + 199449594.

It is an arithmetic number, because the mean of its divisors is an integer number (199449594).

Almost surely, 2^398899187 is an apocalyptic number.

398899187 is a deficient number, since it is larger than the sum of its proper divisors (1).

398899187 is an equidigital number, since it uses as much as digits as its factorization.

398899187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7838208, while the sum is 62.

The square root of 398899187 is about 19972.4607146941. The cubic root of 398899187 is about 736.1297737799.

The spelling of 398899187 in words is "three hundred ninety-eight million, eight hundred ninety-nine thousand, one hundred eighty-seven".