386399988 has 72 divisors (see below), whose sum is σ = 1067652768. Its totient is φ = 117108288.

The previous prime is 386399927. The next prime is 386399989. The reversal of 386399988 is 889993683.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (386399989) 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 23 ways as a sum of consecutive naturals, for example, 25195 + ... + 37517.

Almost surely, 2^386399988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 386399988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (533826384).

386399988 is an abundant number, since it is smaller than the sum of its proper divisors (681252780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

386399988 is a wasteful number, since it uses less digits than its factorization.

386399988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12413 (or 12408 counting only the distinct ones).

The product of its digits is 20155392, while the sum is 63.

The square root of 386399988 is about 19657.0594952551. The cubic root of 386399988 is about 728.3593529388.

The spelling of 386399988 in words is "three hundred eighty-six million, three hundred ninety-nine thousand, nine hundred eighty-eight".