397209957 has 8 divisors (see below), whose sum is σ = 529766784. Its totient is φ = 264729888.

The previous prime is 397209949. The next prime is 397209959. The reversal of 397209957 is 759902793.

It is a happy number.

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

It is not a de Polignac number, because 397209957 - 2³ = 397209949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397209959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5773 + ... + 28770.

It is an arithmetic number, because the mean of its divisors is an integer number (66220848).

Almost surely, 2^397209957 is an apocalyptic number.

It is an amenable number.

397209957 is a deficient number, since it is larger than the sum of its proper divisors (132556827).

397209957 is a wasteful number, since it uses less digits than its factorization.

397209957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38379.

The product of its (nonzero) digits is 1071630, while the sum is 51.

The square root of 397209957 is about 19930.1268686378. The cubic root of 397209957 is about 735.0892001511.

The spelling of 397209957 in words is "three hundred ninety-seven million, two hundred nine thousand, nine hundred fifty-seven".