397889 has 4 divisors (see below), whose sum is σ = 401856. Its totient is φ = 393924.

The previous prime is 397867. The next prime is 397897. The reversal of 397889 is 988793.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 397889 - 2⁸ = 397633 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1829 + ... + 2034.

It is an arithmetic number, because the mean of its divisors is an integer number (100464).

2³⁹⁷⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

397889 is a deficient number, since it is larger than the sum of its proper divisors (3967).

397889 is a wasteful number, since it uses less digits than its factorization.

397889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3966.

The product of its digits is 108864, while the sum is 44.

The square root of 397889 is about 630.7844322746. The cubic root of 397889 is about 73.5507847766.

The spelling of 397889 in words is "three hundred ninety-seven thousand, eight hundred eighty-nine".