397391 has 4 divisors (see below), whose sum is σ = 398784. Its totient is φ = 396000.

The previous prime is 397379. The next prime is 397427. The reversal of 397391 is 193793.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-397391 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 (397301) 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, 95 + ... + 896.

It is an arithmetic number, because the mean of its divisors is an integer number (99696).

2³⁹⁷³⁹¹ is an apocalyptic number.

397391 is a deficient number, since it is larger than the sum of its proper divisors (1393).

397391 is an equidigital number, since it uses as much as digits as its factorization.

397391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1392.

The product of its digits is 5103, while the sum is 32.

The square root of 397391 is about 630.3895620963. The cubic root of 397391 is about 73.5200864472.

The spelling of 397391 in words is "three hundred ninety-seven thousand, three hundred ninety-one".