386988681 has 4 divisors (see below), whose sum is σ = 515984912. Its totient is φ = 257992452.

The previous prime is 386988677. The next prime is 386988737. The reversal of 386988681 is 186889683.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 386988681 - 2² = 386988677 is a prime.

It is a super-2 number, since 2×386988681² = 299520478444239522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (386981681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64498111 + ... + 64498116.

It is an arithmetic number, because the mean of its divisors is an integer number (128996228).

Almost surely, 2^386988681 is an apocalyptic number.

It is an amenable number.

386988681 is a deficient number, since it is larger than the sum of its proper divisors (128996231).

386988681 is a wasteful number, since it uses less digits than its factorization.

386988681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128996230.

The product of its digits is 3981312, while the sum is 57.

The square root of 386988681 is about 19672.0278822495. The cubic root of 386988681 is about 728.7290583361.

The spelling of 386988681 in words is "three hundred eighty-six million, nine hundred eighty-eight thousand, six hundred eighty-one".