397139 has 4 divisors (see below), whose sum is σ = 398520. Its totient is φ = 395760.

The previous prime is 397127. The next prime is 397151. The reversal of 397139 is 931793.

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, and also an emirpimes, since its reverse is a distinct semiprime: 931793 = 53 ⋅17581.

It is an interprime number because it is at equal distance from previous prime (397127) and next prime (397151).

It is a cyclic number.

It is not a de Polignac number, because 397139 - 2⁸ = 396883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397939) 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, 77 + ... + 894.

It is an arithmetic number, because the mean of its divisors is an integer number (99630).

2³⁹⁷¹³⁹ is an apocalyptic number.

397139 is a deficient number, since it is larger than the sum of its proper divisors (1381).

397139 is an equidigital number, since it uses as much as digits as its factorization.

397139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380.

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

The square root of 397139 is about 630.1896539931. The cubic root of 397139 is about 73.5045425795.

The spelling of 397139 in words is "three hundred ninety-seven thousand, one hundred thirty-nine".