391398233 has 4 divisors (see below), whose sum is σ = 411998160. Its totient is φ = 370798308.

The previous prime is 391398229. The next prime is 391398253. The reversal of 391398233 is 332893193.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 391398233 - 2² = 391398229 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391398223) 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, 10299935 + ... + 10299972.

It is an arithmetic number, because the mean of its divisors is an integer number (102999540).

Almost surely, 2^391398233 is an apocalyptic number.

It is an amenable number.

391398233 is a deficient number, since it is larger than the sum of its proper divisors (20599927).

391398233 is a wasteful number, since it uses less digits than its factorization.

391398233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20599926.

The product of its digits is 104976, while the sum is 41.

The square root of 391398233 is about 19783.7871248151. The cubic root of 391398233 is about 731.4864520072.

The spelling of 391398233 in words is "three hundred ninety-one million, three hundred ninety-eight thousand, two hundred thirty-three".