397724 has 6 divisors (see below), whose sum is σ = 696024. Its totient is φ = 198860.

The previous prime is 397723. The next prime is 397729. The reversal of 397724 is 427793.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49712 + ... + 49719.

It is an arithmetic number, because the mean of its divisors is an integer number (116004).

2³⁹⁷⁷²⁴ is an apocalyptic number.

It is an amenable number.

397724 is a deficient number, since it is larger than the sum of its proper divisors (298300).

397724 is a wasteful number, since it uses less digits than its factorization.

397724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99435 (or 99433 counting only the distinct ones).

The product of its digits is 10584, while the sum is 32.

The square root of 397724 is about 630.6536291817. The cubic root of 397724 is about 73.5406164823.

The spelling of 397724 in words is "three hundred ninety-seven thousand, seven hundred twenty-four".