389988989 has 16 divisors (see below), whose sum is σ = 439082112. Its totient is φ = 343683648.

The previous prime is 389988983. The next prime is 389989001. The reversal of 389988989 is 989889983.

It is a cyclic number.

It is not a de Polignac number, because 389988989 - 2⁸ = 389988733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389988983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 225482 + ... + 227204.

It is an arithmetic number, because the mean of its divisors is an integer number (27442632).

Almost surely, 2^389988989 is an apocalyptic number.

It is an amenable number.

389988989 is a deficient number, since it is larger than the sum of its proper divisors (49093123).

389988989 is a wasteful number, since it uses less digits than its factorization.

389988989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2516.

The product of its digits is 80621568, while the sum is 71.

The square root of 389988989 is about 19748.1388743345. The cubic root of 389988989 is about 730.6074814487.

The spelling of 389988989 in words is "three hundred eighty-nine million, nine hundred eighty-eight thousand, nine hundred eighty-nine".