386831138 has 4 divisors (see below), whose sum is σ = 580246710. Its totient is φ = 193415568.

The previous prime is 386831131. The next prime is 386831173. The reversal of 386831138 is 831138683.

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., 309865609 + 76965529 = 17603^2 + 8773^2 .

It is a junction number, because it is equal to n+sod(n) for n = 386831095 and 386831104.

It is not an unprimeable number, because it can be changed into a prime (386831131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96707783 + ... + 96707786.

Almost surely, 2^386831138 is an apocalyptic number.

386831138 is a deficient number, since it is larger than the sum of its proper divisors (193415572).

386831138 is a wasteful number, since it uses less digits than its factorization.

386831138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193415571.

The product of its digits is 82944, while the sum is 41.

The square root of 386831138 is about 19668.0232356991. The cubic root of 386831138 is about 728.6301564384.

The spelling of 386831138 in words is "three hundred eighty-six million, eight hundred thirty-one thousand, one hundred thirty-eight".