397806922 has 4 divisors (see below), whose sum is σ = 596710386. Its totient is φ = 198903460.

The previous prime is 397806901. The next prime is 397806931. The reversal of 397806922 is 229608793.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 324036001 + 73770921 = 18001^2 + 8589^2 .

It is a super-2 number, since 2×397806922² = 316500694382228168, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99451729 + ... + 99451732.

Almost surely, 2^397806922 is an apocalyptic number.

397806922 is a deficient number, since it is larger than the sum of its proper divisors (198903464).

397806922 is a wasteful number, since it uses less digits than its factorization.

397806922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198903463.

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 397806922 is about 19945.0976934183. The cubic root of 397806922 is about 735.4572698711.

The spelling of 397806922 in words is "three hundred ninety-seven million, eight hundred six thousand, nine hundred twenty-two".