386689391 has 4 divisors (see below), whose sum is σ = 421842984. Its totient is φ = 351535800.

The previous prime is 386689379. The next prime is 386689397. The reversal of 386689391 is 193986683.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 193986683 = 11 ⋅17635153.

It is not a de Polignac number, because 386689391 - 2¹⁸ = 386427247 is a prime.

It is a super-2 number, since 2×386689391² = 299057370223901762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (386689397) 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, 17576780 + ... + 17576801.

It is an arithmetic number, because the mean of its divisors is an integer number (105460746).

Almost surely, 2^386689391 is an apocalyptic number.

386689391 is a deficient number, since it is larger than the sum of its proper divisors (35153593).

386689391 is a wasteful number, since it uses less digits than its factorization.

386689391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35153592.

The product of its digits is 1679616, while the sum is 53.

The square root of 386689391 is about 19664.4194168046. The cubic root of 386689391 is about 728.5411479570.

The spelling of 386689391 in words is "three hundred eighty-six million, six hundred eighty-nine thousand, three hundred ninety-one".