397646646 has 16 divisors (see below), whose sum is σ = 795543744. Its totient is φ = 132507144.

The previous prime is 397646633. The next prime is 397646653. The reversal of 397646646 is 646646793.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14961 + ... + 31923.

It is an arithmetic number, because the mean of its divisors is an integer number (49721484).

Almost surely, 2^397646646 is an apocalyptic number.

397646646 is an abundant number, since it is smaller than the sum of its proper divisors (397897098).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

397646646 is a wasteful number, since it uses less digits than its factorization.

397646646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20875.

The product of its digits is 3919104, while the sum is 51.

The square root of 397646646 is about 19941.0793589515. The cubic root of 397646646 is about 735.3584849437.

The spelling of 397646646 in words is "three hundred ninety-seven million, six hundred forty-six thousand, six hundred forty-six".