388702989 has 16 divisors (see below), whose sum is σ = 583148800. Its totient is φ = 255853728.

The previous prime is 388702973. The next prime is 388702999. The reversal of 388702989 is 989207883.

It is not a de Polignac number, because 388702989 - 2⁴ = 388702973 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 (388702939) 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, 88984 + ... + 93249.

It is an arithmetic number, because the mean of its divisors is an integer number (36446800).

Almost surely, 2^388702989 is an apocalyptic number.

It is an amenable number.

388702989 is a deficient number, since it is larger than the sum of its proper divisors (194445811).

388702989 is a wasteful number, since it uses less digits than its factorization.

388702989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182321 (or 182315 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 54.

The square root of 388702989 is about 19715.5519577820. The cubic root of 388702989 is about 729.8035306644.

The spelling of 388702989 in words is "three hundred eighty-eight million, seven hundred two thousand, nine hundred eighty-nine".