393289897 has 32 divisors (see below), whose sum is σ = 530095104. Its totient is φ = 281793600.

The previous prime is 393289891. The next prime is 393289913. The reversal of 393289897 is 798982393.

It is not a de Polignac number, because 393289897 - 2⁷ = 393289769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (393289891) 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 31 ways as a sum of consecutive naturals, for example, 330738 + ... + 331924.

It is an arithmetic number, because the mean of its divisors is an integer number (16565472).

Almost surely, 2^393289897 is an apocalyptic number.

It is an amenable number.

393289897 is a deficient number, since it is larger than the sum of its proper divisors (136805207).

393289897 is a wasteful number, since it uses less digits than its factorization.

393289897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1549.

The product of its digits is 5878656, while the sum is 58.

The square root of 393289897 is about 19831.5379383446. The cubic root of 393289897 is about 732.6630058862.

The spelling of 393289897 in words is "three hundred ninety-three million, two hundred eighty-nine thousand, eight hundred ninety-seven".