397690 has 8 divisors (see below), whose sum is σ = 715860. Its totient is φ = 159072.

The previous prime is 397687. The next prime is 397697. The reversal of 397690 is 96793.

It can be written as a sum of positive squares in 2 ways, for example, as 368449 + 29241 = 607^2 + 171^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×397690² = 316314672200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (397697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19875 + ... + 19894.

2³⁹⁷⁶⁹⁰ is an apocalyptic number.

397690 is a deficient number, since it is larger than the sum of its proper divisors (318170).

397690 is a wasteful number, since it uses less digits than its factorization.

397690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39776.

The product of its (nonzero) digits is 10206, while the sum is 34.

The square root of 397690 is about 630.6266724458. The cubic root of 397690 is about 73.5385208480.

The spelling of 397690 in words is "three hundred ninety-seven thousand, six hundred ninety".