397791892 has 12 divisors (see below), whose sum is σ = 705672436. Its totient is φ = 196171200.

The previous prime is 397791853. The next prime is 397791893. The reversal of 397791892 is 298197793.

It can be written as a sum of positive squares in 2 ways, for example, as 173870596 + 223921296 = 13186^2 + 14964^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397791893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 680859 + ... + 681442.

Almost surely, 2^397791892 is an apocalyptic number.

It is an amenable number.

397791892 is a deficient number, since it is larger than the sum of its proper divisors (307880544).

397791892 is a wasteful number, since it uses less digits than its factorization.

397791892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1362378 (or 1362376 counting only the distinct ones).

The product of its digits is 1714608, while the sum is 55.

The square root of 397791892 is about 19944.7209055429. The cubic root of 397791892 is about 735.4480073693.

The spelling of 397791892 in words is "three hundred ninety-seven million, seven hundred ninety-one thousand, eight hundred ninety-two".