397942 has 4 divisors (see below), whose sum is σ = 596916. Its totient is φ = 198970.

The previous prime is 397939. The next prime is 397951. The reversal of 397942 is 249793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 249793 = 19 ⋅13147.

It is a junction number, because it is equal to n+sod(n) for n = 397898 and 397907.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99484 + ... + 99487.

It is an arithmetic number, because the mean of its divisors is an integer number (149229).

2³⁹⁷⁹⁴² is an apocalyptic number.

397942 is a deficient number, since it is larger than the sum of its proper divisors (198974).

397942 is a wasteful number, since it uses less digits than its factorization.

397942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198973.

The product of its digits is 13608, while the sum is 34.

The square root of 397942 is about 630.8264420584. The cubic root of 397942 is about 73.5540503595.

The spelling of 397942 in words is "three hundred ninety-seven thousand, nine hundred forty-two".