138989501 has 16 divisors (see below), whose sum is σ = 172740096. Its totient is φ = 109092096.

The previous prime is 138989471. The next prime is 138989509. The reversal of 138989501 is 105989831.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 138989501 - 2²⁶ = 71880637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138989509) 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, 11381 + ... + 20186.

It is an arithmetic number, because the mean of its divisors is an integer number (10796256).

Almost surely, 2^138989501 is an apocalyptic number.

It is an amenable number.

138989501 is a deficient number, since it is larger than the sum of its proper divisors (33750595).

138989501 is a wasteful number, since it uses less digits than its factorization.

138989501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31628.

The product of its (nonzero) digits is 77760, while the sum is 44.

The square root of 138989501 is about 11789.3808573648. The cubic root of 138989501 is about 517.9971042309.

The spelling of 138989501 in words is "one hundred thirty-eight million, nine hundred eighty-nine thousand, five hundred one".