398111663 has 4 divisors (see below), whose sum is σ = 398388240. Its totient is φ = 397835088.

The previous prime is 398111657. The next prime is 398111671. The reversal of 398111663 is 366111893.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 398111663 - 2⁸ = 398111407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398114663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136118 + ... + 139011.

It is an arithmetic number, because the mean of its divisors is an integer number (99597060).

Almost surely, 2^398111663 is an apocalyptic number.

398111663 is a deficient number, since it is larger than the sum of its proper divisors (276577).

398111663 is a wasteful number, since it uses less digits than its factorization.

398111663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276576.

The product of its digits is 23328, while the sum is 38.

The square root of 398111663 is about 19952.7357272129. The cubic root of 398111663 is about 735.6450215714.

The spelling of 398111663 in words is "three hundred ninety-eight million, one hundred eleven thousand, six hundred sixty-three".