397681635 has 32 divisors (see below), whose sum is σ = 693520128. Its totient is φ = 193415040.

The previous prime is 397681621. The next prime is 397681643. The reversal of 397681635 is 536186793.

It is a happy number.

It is not a de Polignac number, because 397681635 - 2⁷ = 397681507 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3900 + ... + 28470.

It is an arithmetic number, because the mean of its divisors is an integer number (21672504).

Almost surely, 2^397681635 is an apocalyptic number.

397681635 is a deficient number, since it is larger than the sum of its proper divisors (295838493).

397681635 is a wasteful number, since it uses less digits than its factorization.

397681635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24675.

The product of its digits is 816480, while the sum is 48.

The square root of 397681635 is about 19941.9566492358. The cubic root of 397681635 is about 735.3800524197.

The spelling of 397681635 in words is "three hundred ninety-seven million, six hundred eighty-one thousand, six hundred thirty-five".