187138138 has 8 divisors (see below), whose sum is σ = 306226080. Its totient is φ = 85062780.

The previous prime is 187138129. The next prime is 187138213. The reversal of 187138138 is 831831781.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 187138138.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4253118 + ... + 4253161.

It is an arithmetic number, because the mean of its divisors is an integer number (38278260).

Almost surely, 2^187138138 is an apocalyptic number.

187138138 is a deficient number, since it is larger than the sum of its proper divisors (119087942).

187138138 is a wasteful number, since it uses less digits than its factorization.

187138138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8506292.

The product of its digits is 32256, while the sum is 40.

The square root of 187138138 is about 13679.8442242593. The cubic root of 187138138 is about 571.9886809666.

The spelling of 187138138 in words is "one hundred eighty-seven million, one hundred thirty-eight thousand, one hundred thirty-eight".