397660 has 24 divisors (see below), whose sum is σ = 851760. Its totient is φ = 155904.

The previous prime is 397643. The next prime is 397673. The reversal of 397660 is 66793.

397660 = T₂₇₇ + T₂₇₈ + ... + T₂₈₆.

It is a congruent number.

It is an unprimeable number.

397660 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1012 + ... + 1348.

It is an arithmetic number, because the mean of its divisors is an integer number (35490).

2³⁹⁷⁶⁶⁰ is an apocalyptic number.

It is an amenable number.

397660 is an abundant number, since it is smaller than the sum of its proper divisors (454100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

397660 is a wasteful number, since it uses less digits than its factorization.

397660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405 (or 403 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 31.

The square root of 397660 is about 630.6028861336. The cubic root of 397660 is about 73.5366716596.

The spelling of 397660 in words is "three hundred ninety-seven thousand, six hundred sixty".