389979989 has 16 divisors (see below), whose sum is σ = 454989312. Its totient is φ = 327320448.

The previous prime is 389979979. The next prime is 389979991. The reversal of 389979989 is 989979983.

It is not a de Polignac number, because 389979989 - 2¹⁶ = 389914453 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389979979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 353012 + ... + 354114.

It is an arithmetic number, because the mean of its divisors is an integer number (28436832).

Almost surely, 2^389979989 is an apocalyptic number.

It is an amenable number.

389979989 is a deficient number, since it is larger than the sum of its proper divisors (65009323).

389979989 is a wasteful number, since it uses less digits than its factorization.

389979989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2116.

The product of its digits is 79361856, while the sum is 71.

The square root of 389979989 is about 19747.9110034454. The cubic root of 389979989 is about 730.6018611892.

The spelling of 389979989 in words is "three hundred eighty-nine million, nine hundred seventy-nine thousand, nine hundred eighty-nine".