388379986 has 4 divisors (see below), whose sum is σ = 582569982. Its totient is φ = 194189992.

The previous prime is 388379963. The next prime is 388379987. The reversal of 388379986 is 689973883.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 201100761 + 187279225 = 14181^2 + 13685^2 .

It is not an unprimeable number, because it can be changed into a prime (388379987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97094995 + ... + 97094998.

Almost surely, 2^388379986 is an apocalyptic number.

388379986 is a deficient number, since it is larger than the sum of its proper divisors (194189996).

388379986 is a wasteful number, since it uses less digits than its factorization.

388379986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194189995.

The product of its digits is 15676416, while the sum is 61.

The square root of 388379986 is about 19707.3586763929. The cubic root of 388379986 is about 729.6013248143.

The spelling of 388379986 in words is "three hundred eighty-eight million, three hundred seventy-nine thousand, nine hundred eighty-six".