388707989 has 16 divisors (see below), whose sum is σ = 405440640. Its totient is φ = 372415680.

The previous prime is 388707971. The next prime is 388708057. The reversal of 388707989 is 989707883.

It is a cyclic number.

It is not a de Polignac number, because 388707989 - 2⁸ = 388707733 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388707919) 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, 615704 + ... + 616334.

It is an arithmetic number, because the mean of its divisors is an integer number (25340040).

Almost surely, 2^388707989 is an apocalyptic number.

It is an amenable number.

388707989 is a deficient number, since it is larger than the sum of its proper divisors (16732651).

388707989 is a wasteful number, since it uses less digits than its factorization.

388707989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940.

The product of its (nonzero) digits is 6096384, while the sum is 59.

The square root of 388707989 is about 19715.6787608238. The cubic root of 388707989 is about 729.8066598762.

The spelling of 388707989 in words is "three hundred eighty-eight million, seven hundred seven thousand, nine hundred eighty-nine".