138531086 has 16 divisors (see below), whose sum is σ = 217058400. Its totient is φ = 66224928.

The previous prime is 138531073. The next prime is 138531089. The reversal of 138531086 is 680135831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138531089) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5621 + ... + 17568.

It is an arithmetic number, because the mean of its divisors is an integer number (13566150).

Almost surely, 2^138531086 is an apocalyptic number.

138531086 is a deficient number, since it is larger than the sum of its proper divisors (78527314).

138531086 is a wasteful number, since it uses less digits than its factorization.

138531086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23323.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 138531086 is about 11769.9229394249. The cubic root of 138531086 is about 517.4269911863.

The spelling of 138531086 in words is "one hundred thirty-eight million, five hundred thirty-one thousand, eighty-six".