397440772 has 6 divisors (see below), whose sum is σ = 695521358. Its totient is φ = 198720384.

The previous prime is 397440767. The next prime is 397440779. The reversal of 397440772 is 277044793.

It can be written as a sum of positive squares in only one way, i.e., 317409856 + 80030916 = 17816^2 + 8946^2 .

It is not an unprimeable number, because it can be changed into a prime (397440779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49680093 + ... + 49680100.

Almost surely, 2^397440772 is an apocalyptic number.

It is an amenable number.

397440772 is a deficient number, since it is larger than the sum of its proper divisors (298080586).

397440772 is a wasteful number, since it uses less digits than its factorization.

397440772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99360197 (or 99360195 counting only the distinct ones).

The product of its (nonzero) digits is 296352, while the sum is 43.

The square root of 397440772 is about 19935.9166330520. The cubic root of 397440772 is about 735.2315570725.

The spelling of 397440772 in words is "three hundred ninety-seven million, four hundred forty thousand, seven hundred seventy-two".