397827992 has 16 divisors (see below), whose sum is σ = 746201400. Its totient is φ = 198840960.

The previous prime is 397827971. The next prime is 397828001. The reversal of 397827992 is 299728793.

It is a super-2 number, since 2×397827992² = 316534222437504128, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19184 + ... + 34112.

Almost surely, 2^397827992 is an apocalyptic number.

It is an amenable number.

397827992 is a deficient number, since it is larger than the sum of its proper divisors (348373408).

397827992 is a wasteful number, since it uses less digits than its factorization.

397827992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18266 (or 18262 counting only the distinct ones).

The product of its digits is 3429216, while the sum is 56.

The square root of 397827992 is about 19945.6258863942. The cubic root of 397827992 is about 735.4702542363.

It can be divided in two parts, 39782 and 7992, that added together give a palindrome (47774).

The spelling of 397827992 in words is "three hundred ninety-seven million, eight hundred twenty-seven thousand, nine hundred ninety-two".