397123857 has 32 divisors (see below), whose sum is σ = 654044160. Its totient is φ = 236494080.

The previous prime is 397123817. The next prime is 397123871. The reversal of 397123857 is 758321793.

It is a happy number.

It is not a de Polignac number, because 397123857 - 2⁷ = 397123729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (397123817) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7368 + ... + 29129.

It is an arithmetic number, because the mean of its divisors is an integer number (20438880).

Almost surely, 2^397123857 is an apocalyptic number.

It is an amenable number.

397123857 is a deficient number, since it is larger than the sum of its proper divisors (256920303).

397123857 is a wasteful number, since it uses less digits than its factorization.

397123857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36550 (or 36544 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The square root of 397123857 is about 19927.9667051107. The cubic root of 397123857 is about 735.0360831931.

The spelling of 397123857 in words is "three hundred ninety-seven million, one hundred twenty-three thousand, eight hundred fifty-seven".