397534889 has 4 divisors (see below), whose sum is σ = 401470980. Its totient is φ = 393598800.

The previous prime is 397534877. The next prime is 397534897. The reversal of 397534889 is 988435793.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 287641600 + 109893289 = 16960^2 + 10483^2 .

It is a cyclic number.

It is not a de Polignac number, because 397534889 - 2⁸ = 397534633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397534849) 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 3 ways as a sum of consecutive naturals, for example, 1967894 + ... + 1968095.

It is an arithmetic number, because the mean of its divisors is an integer number (100367745).

Almost surely, 2^397534889 is an apocalyptic number.

It is an amenable number.

397534889 is a deficient number, since it is larger than the sum of its proper divisors (3936091).

397534889 is a wasteful number, since it uses less digits than its factorization.

397534889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3936090.

The product of its digits is 6531840, while the sum is 56.

The square root of 397534889 is about 19938.2769817254. The cubic root of 397534889 is about 735.2895886349.

The spelling of 397534889 in words is "three hundred ninety-seven million, five hundred thirty-four thousand, eight hundred eighty-nine".