398917111 has 2 divisors, whose sum is σ = 398917112. Its totient is φ = 398917110.

The previous prime is 398917109. The next prime is 398917133. The reversal of 398917111 is 111719893.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 398917111 - 2¹ = 398917109 is a prime.

It is a super-2 number, since 2×398917111² = 318269722897172642, which contains 22 as substring.

Together with 398917109, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398917171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199458555 + 199458556.

It is an arithmetic number, because the mean of its divisors is an integer number (199458556).

Almost surely, 2^398917111 is an apocalyptic number.

398917111 is a deficient number, since it is larger than the sum of its proper divisors (1).

398917111 is an equidigital number, since it uses as much as digits as its factorization.

398917111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 40.

The square root of 398917111 is about 19972.9094275221. The cubic root of 398917111 is about 736.1407992828.

The spelling of 398917111 in words is "three hundred ninety-eight million, nine hundred seventeen thousand, one hundred eleven".