393347889 has 27 divisors (see below), whose sum is σ = 625557387. Its totient is φ = 237996000.

The previous prime is 393347879. The next prime is 393347893. The reversal of 393347889 is 988743393.

The square root of 393347889 is 19833.

It is a perfect power (a square), and thus also a powerful number.

393347889 is a `hidden beast` number, since 3 + 93 + 3 + 478 + 89 = 666.

It can be written as a sum of positive squares in only one way, i.e., 330621489 + 62726400 = 18183^2 + 7920^2 .

It is not a de Polignac number, because 393347889 - 2⁷ = 393347761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (393347839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 654189 + ... + 654789.

Almost surely, 2^393347889 is an apocalyptic number.

393347889 is the 19833-rd square number.

393347889 is the 9917-th centered octagonal number.

It is an amenable number.

393347889 is a deficient number, since it is larger than the sum of its proper divisors (232209498).

393347889 is an equidigital number, since it uses as much as digits as its factorization.

393347889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1230 (or 615 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The cubic root of 393347889 is about 732.6990153754.

The spelling of 393347889 in words is "three hundred ninety-three million, three hundred forty-seven thousand, eight hundred eighty-nine".