397929 has 12 divisors (see below), whose sum is σ = 617424. Its totient is φ = 227304.

The previous prime is 397921. The next prime is 397939. The reversal of 397929 is 929793.

397929 = 65² + 66² + ... + 113².

It is not a de Polignac number, because 397929 - 2³ = 397921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (397921) 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, 1207 + ... + 1500.

It is an arithmetic number, because the mean of its divisors is an integer number (51452).

2³⁹⁷⁹²⁹ is an apocalyptic number.

It is an amenable number.

397929 is a deficient number, since it is larger than the sum of its proper divisors (219495).

397929 is a wasteful number, since it uses less digits than its factorization.

397929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2724 (or 2717 counting only the distinct ones).

The product of its digits is 30618, while the sum is 39.

The square root of 397929 is about 630.8161380307. The cubic root of 397929 is about 73.5532493943.

It can be divided in two parts, 397 and 929, that added together give a triangular number (1326 = T₅₁).

The spelling of 397929 in words is "three hundred ninety-seven thousand, nine hundred twenty-nine".