397177992 has 40 divisors (see below), whose sum is σ = 1112467950. Its totient is φ = 132392448.

The previous prime is 397177973. The next prime is 397177993. The reversal of 397177992 is 299771793.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 373030596 + 24147396 = 19314^2 + 4914^2 .

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

It is not an unprimeable number, because it can be changed into a prime (397177993) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 305817 + ... + 307112.

Almost surely, 2^397177992 is an apocalyptic number.

It is an amenable number.

397177992 is an abundant number, since it is smaller than the sum of its proper divisors (715289958).

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

397177992 is a wasteful number, since it uses less digits than its factorization.

397177992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612947 (or 612934 counting only the distinct ones).

The product of its digits is 1500282, while the sum is 54.

The square root of 397177992 is about 19929.3249258473. The cubic root of 397177992 is about 735.0694811450.

The spelling of 397177992 in words is "three hundred ninety-seven million, one hundred seventy-seven thousand, nine hundred ninety-two".