138188687 has 16 divisors (see below), whose sum is σ = 170472960. Its totient is φ = 109082592.

The previous prime is 138188671. The next prime is 138188689. The reversal of 138188687 is 786881831.

It is not a de Polignac number, because 138188687 - 2⁴ = 138188671 is a prime.

It is a super-2 number, since 2×138188687² = 38192226429567938, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138188689) 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, 44264 + ... + 47282.

It is an arithmetic number, because the mean of its divisors is an integer number (10654560).

Almost surely, 2^138188687 is an apocalyptic number.

138188687 is a deficient number, since it is larger than the sum of its proper divisors (32284273).

138188687 is a wasteful number, since it uses less digits than its factorization.

138188687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3542.

The product of its digits is 516096, while the sum is 50.

The square root of 138188687 is about 11755.3684331883. The cubic root of 138188687 is about 517.0003417023. Note that the first 3 decimals are identical.

The spelling of 138188687 in words is "one hundred thirty-eight million, one hundred eighty-eight thousand, six hundred eighty-seven".