186195138 has 16 divisors (see below), whose sum is σ = 385231680. Its totient is φ = 59924816.

The previous prime is 186195131. The next prime is 186195221. The reversal of 186195138 is 831591681.

It is a self number, because there is not a number n which added to its sum of digits gives 186195138.

It is not an unprimeable number, because it can be changed into a prime (186195131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 534870 + ... + 535217.

It is an arithmetic number, because the mean of its divisors is an integer number (24076980).

Almost surely, 2^186195138 is an apocalyptic number.

186195138 is an abundant number, since it is smaller than the sum of its proper divisors (199036542).

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

186195138 is a wasteful number, since it uses less digits than its factorization.

186195138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1070121.

The product of its digits is 51840, while the sum is 42.

The square root of 186195138 is about 13645.3339277571. Note that the first 3 decimals coincide. The cubic root of 186195138 is about 571.0263012065.

The spelling of 186195138 in words is "one hundred eighty-six million, one hundred ninety-five thousand, one hundred thirty-eight".