397645389 has 32 divisors (see below), whose sum is σ = 599760000. Its totient is φ = 260347392.

The previous prime is 397645387. The next prime is 397645393. The reversal of 397645389 is 983546793.

397645389 is a `hidden beast` number, since 39 + 76 + 4 + 538 + 9 = 666.

It is not a de Polignac number, because 397645389 - 2¹ = 397645387 is a prime.

It is a super-2 number, since 2×397645389² = 316243710785922642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397645387) 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 31 ways as a sum of consecutive naturals, for example, 389722 + ... + 390740.

It is an arithmetic number, because the mean of its divisors is an integer number (18742500).

Almost surely, 2^397645389 is an apocalyptic number.

It is an amenable number.

397645389 is a deficient number, since it is larger than the sum of its proper divisors (202114611).

397645389 is a wasteful number, since it uses less digits than its factorization.

397645389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1274 (or 1268 counting only the distinct ones).

The product of its digits is 4898880, while the sum is 54.

The square root of 397645389 is about 19941.0478410739. The cubic root of 397645389 is about 735.3577100962.

The spelling of 397645389 in words is "three hundred ninety-seven million, six hundred forty-five thousand, three hundred eighty-nine".