138617187 has 16 divisors (see below), whose sum is σ = 195864480. Its totient is φ = 87046400.

The previous prime is 138617183. The next prime is 138617189. The reversal of 138617187 is 781716831.

It is not a de Polignac number, because 138617187 - 2² = 138617183 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138617183) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15864 + ... + 22997.

It is an arithmetic number, because the mean of its divisors is an integer number (12241530).

Almost surely, 2^138617187 is an apocalyptic number.

138617187 is a deficient number, since it is larger than the sum of its proper divisors (57247293).

138617187 is a wasteful number, since it uses less digits than its factorization.

138617187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38934.

The product of its digits is 56448, while the sum is 42.

The square root of 138617187 is about 11773.5800417715. The cubic root of 138617187 is about 517.5341675030.

The spelling of 138617187 in words is "one hundred thirty-eight million, six hundred seventeen thousand, one hundred eighty-seven".