397689443 has 4 divisors (see below), whose sum is σ = 401338080. Its totient is φ = 394040808.

The previous prime is 397689403. The next prime is 397689511. The reversal of 397689443 is 344986793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 344986793 = 2767 ⋅124679.

It is a cyclic number.

It is not a de Polignac number, because 397689443 - 2²⁴ = 380912227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397689403) 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, 1824155 + ... + 1824372.

It is an arithmetic number, because the mean of its divisors is an integer number (100334520).

Almost surely, 2^397689443 is an apocalyptic number.

397689443 is a deficient number, since it is larger than the sum of its proper divisors (3648637).

397689443 is a wasteful number, since it uses less digits than its factorization.

397689443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3648636.

The product of its digits is 3919104, while the sum is 53.

The square root of 397689443 is about 19942.1524164269. The cubic root of 397689443 is about 735.3848651554.

The spelling of 397689443 in words is "three hundred ninety-seven million, six hundred eighty-nine thousand, four hundred forty-three".