187690138 has 4 divisors (see below), whose sum is σ = 281535210. Its totient is φ = 93845068.

The previous prime is 187690123. The next prime is 187690147. The reversal of 187690138 is 831096781.

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., 138227049 + 49463089 = 11757^2 + 7033^2 .

It is a junction number, because it is equal to n+sod(n) for n = 187690094 and 187690103.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 46922533 + ... + 46922536.

Almost surely, 2^187690138 is an apocalyptic number.

187690138 is a deficient number, since it is larger than the sum of its proper divisors (93845072).

187690138 is an equidigital number, since it uses as much as digits as its factorization.

187690138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93845071.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 187690138 is about 13700.0050364954. The cubic root of 187690138 is about 572.5505258510.

The spelling of 187690138 in words is "one hundred eighty-seven million, six hundred ninety thousand, one hundred thirty-eight".