397222057 has 8 divisors (see below), whose sum is σ = 405975752. Its totient is φ = 388540800.

The previous prime is 397222039. The next prime is 397222061. The reversal of 397222057 is 750222793.

It can be written as a sum of positive squares in 4 ways, for example, as 1371241 + 395850816 = 1171^2 + 19896^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397222057 is a prime.

It is a super-2 number, since 2×397222057² = 315570725134622498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397222087) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6948 + ... + 29029.

It is an arithmetic number, because the mean of its divisors is an integer number (50746969).

Almost surely, 2^397222057 is an apocalyptic number.

It is an amenable number.

397222057 is a deficient number, since it is larger than the sum of its proper divisors (8753695).

397222057 is a wasteful number, since it uses less digits than its factorization.

397222057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36219.

The product of its (nonzero) digits is 52920, while the sum is 37.

The square root of 397222057 is about 19930.4304268623. The cubic root of 397222057 is about 735.0966642884.

The spelling of 397222057 in words is "three hundred ninety-seven million, two hundred twenty-two thousand, fifty-seven".