397943766 has 40 divisors (see below), whose sum is σ = 972755784. Its totient is φ = 120588480.

The previous prime is 397943747. The next prime is 397943773. The reversal of 397943766 is 667349793.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 109875 + ... + 113438.

Almost surely, 2^397943766 is an apocalyptic number.

397943766 is an abundant number, since it is smaller than the sum of its proper divisors (574812018).

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

397943766 is a wasteful number, since it uses less digits than its factorization.

397943766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223338 (or 223329 counting only the distinct ones).

The product of its digits is 5143824, while the sum is 54.

The square root of 397943766 is about 19948.5279156132. The cubic root of 397943766 is about 735.5415916622.

The spelling of 397943766 in words is "three hundred ninety-seven million, nine hundred forty-three thousand, seven hundred sixty-six".