397930789 has 16 divisors (see below), whose sum is σ = 415908864. Its totient is φ = 380419200.

The previous prime is 397930733. The next prime is 397930823. The reversal of 397930789 is 987039793.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397930789 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 (397930289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 648847 + ... + 649459.

It is an arithmetic number, because the mean of its divisors is an integer number (25994304).

Almost surely, 2^397930789 is an apocalyptic number.

It is an amenable number.

397930789 is a deficient number, since it is larger than the sum of its proper divisors (17978075).

397930789 is a wasteful number, since it uses less digits than its factorization.

397930789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 948.

The product of its (nonzero) digits is 2571912, while the sum is 55.

The square root of 397930789 is about 19948.2026508656. The cubic root of 397930789 is about 735.5335962051.

The spelling of 397930789 in words is "three hundred ninety-seven million, nine hundred thirty thousand, seven hundred eighty-nine".