397423391 has 4 divisors (see below), whose sum is σ = 397468800. Its totient is φ = 397377984.

The previous prime is 397423387. The next prime is 397423447. The reversal of 397423391 is 193324793.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 397423391 - 2² = 397423387 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 (397423321) 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, 4946 + ... + 28623.

It is an arithmetic number, because the mean of its divisors is an integer number (99367200).

Almost surely, 2^397423391 is an apocalyptic number.

397423391 is a deficient number, since it is larger than the sum of its proper divisors (45409).

397423391 is a wasteful number, since it uses less digits than its factorization.

397423391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45408.

The product of its digits is 122472, while the sum is 41.

The square root of 397423391 is about 19935.4807065192. The cubic root of 397423391 is about 735.2208391266.

The spelling of 397423391 in words is "three hundred ninety-seven million, four hundred twenty-three thousand, three hundred ninety-one".