186817138 has 8 divisors (see below), whose sum is σ = 281007360. Its totient is φ = 93148020.

The previous prime is 186817123. The next prime is 186817157. The reversal of 186817138 is 831718681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×186817138² = 69801286101022088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 186817094 and 186817103.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 129378 + ... + 130813.

It is an arithmetic number, because the mean of its divisors is an integer number (35125920).

Almost surely, 2^186817138 is an apocalyptic number.

186817138 is a deficient number, since it is larger than the sum of its proper divisors (94190222).

186817138 is a wasteful number, since it uses less digits than its factorization.

186817138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260552.

The product of its digits is 64512, while the sum is 43.

The square root of 186817138 is about 13668.1065989405. The cubic root of 186817138 is about 571.6614477429.

The spelling of 186817138 in words is "one hundred eighty-six million, eight hundred seventeen thousand, one hundred thirty-eight".