397839 has 12 divisors (see below), whose sum is σ = 576968. Its totient is φ = 242400.

The previous prime is 397829. The next prime is 397849. The reversal of 397839 is 938793.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (397829) and next prime (397849).

It is not a de Polignac number, because 397839 - 2⁵ = 397807 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 397797 and 397806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397829) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3889 + ... + 3989.

2³⁹⁷⁸³⁹ is an apocalyptic number.

397839 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

397839 is a deficient number, since it is larger than the sum of its proper divisors (179129).

397839 is a wasteful number, since it uses less digits than its factorization.

397839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218 (or 117 counting only the distinct ones).

The product of its digits is 40824, while the sum is 39.

The square root of 397839 is about 630.7447978382. The cubic root of 397839 is about 73.5477037722.

Multiplying 397839 by its sum of digits (39), we get a square (15515721 = 3939²).

397839 divided by its sum of digits (39) gives a palindrome (10201).

The spelling of 397839 in words is "three hundred ninety-seven thousand, eight hundred thirty-nine".