397978 has 24 divisors (see below), whose sum is σ = 722304. Its totient is φ = 163800.

The previous prime is 397973. The next prime is 397981. The reversal of 397978 is 879793.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397973) 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, 2973 + ... + 3103.

It is an arithmetic number, because the mean of its divisors is an integer number (30096).

2³⁹⁷⁹⁷⁸ is an apocalyptic number.

397978 is a deficient number, since it is larger than the sum of its proper divisors (324326).

397978 is a wasteful number, since it uses less digits than its factorization.

397978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178 (or 171 counting only the distinct ones).

The product of its digits is 95256, while the sum is 43.

The square root of 397978 is about 630.8549754104. The cubic root of 397978 is about 73.5562683259.

The spelling of 397978 in words is "three hundred ninety-seven thousand, nine hundred seventy-eight".