397257189 has 8 divisors (see below), whose sum is σ = 605344320. Its totient is φ = 227004096.

The previous prime is 397257169. The next prime is 397257191. The reversal of 397257189 is 981752793.

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

It is not a de Polignac number, because 397257189 - 2⁷ = 397257061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397257169) 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, 9458484 + ... + 9458525.

It is an arithmetic number, because the mean of its divisors is an integer number (75668040).

Almost surely, 2^397257189 is an apocalyptic number.

It is an amenable number.

397257189 is a deficient number, since it is larger than the sum of its proper divisors (208087131).

397257189 is a wasteful number, since it uses less digits than its factorization.

397257189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18917019.

The product of its digits is 952560, while the sum is 51.

The square root of 397257189 is about 19931.3117731874. The cubic root of 397257189 is about 735.1183353363.

The spelling of 397257189 in words is "three hundred ninety-seven million, two hundred fifty-seven thousand, one hundred eighty-nine".