397990 has 8 divisors (see below), whose sum is σ = 716400. Its totient is φ = 159192.

The previous prime is 397981. The next prime is 398011. The reversal of 397990 is 99793.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19890 + ... + 19909.

It is an arithmetic number, because the mean of its divisors is an integer number (89550).

2³⁹⁷⁹⁹⁰ is an apocalyptic number.

397990 is a deficient number, since it is larger than the sum of its proper divisors (318410).

397990 is a wasteful number, since it uses less digits than its factorization.

397990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39806.

The product of its (nonzero) digits is 15309, while the sum is 37.

The square root of 397990 is about 630.8644862409. The cubic root of 397990 is about 73.5570076184.

The spelling of 397990 in words is "three hundred ninety-seven thousand, nine hundred ninety".