397635646 has 8 divisors (see below), whose sum is σ = 617020920. Its totient is φ = 191962008.

The previous prime is 397635611. The next prime is 397635683. The reversal of 397635646 is 646536793.

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

It is a super-2 number, since 2×397635646² = 316228213939674632, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 397635646.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3427836 + ... + 3427951.

It is an arithmetic number, because the mean of its divisors is an integer number (77127615).

Almost surely, 2^397635646 is an apocalyptic number.

397635646 is a deficient number, since it is larger than the sum of its proper divisors (219385274).

397635646 is a wasteful number, since it uses less digits than its factorization.

397635646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6855818.

The product of its digits is 2449440, while the sum is 49.

The square root of 397635646 is about 19940.8035444914. The cubic root of 397635646 is about 735.3517042017.

The spelling of 397635646 in words is "three hundred ninety-seven million, six hundred thirty-five thousand, six hundred forty-six".