397790690 has 32 divisors (see below), whose sum is σ = 788439744. Its totient is φ = 143295040.

The previous prime is 397790689. The next prime is 397790693. The reversal of 397790690 is 96097793.

It is a happy number.

It is a super-2 number, since 2×397790690² = 316474866101352200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (397790693) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5129 + ... + 28668.

It is an arithmetic number, because the mean of its divisors is an integer number (24638742).

Almost surely, 2^397790690 is an apocalyptic number.

397790690 is a deficient number, since it is larger than the sum of its proper divisors (390649054).

397790690 is a wasteful number, since it uses less digits than its factorization.

397790690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33922.

The product of its (nonzero) digits is 642978, while the sum is 50.

The square root of 397790690 is about 19944.6907722331. The cubic root of 397790690 is about 735.4472666056.

The spelling of 397790690 in words is "three hundred ninety-seven million, seven hundred ninety thousand, six hundred ninety".