138692523 has 4 divisors (see below), whose sum is σ = 184923368. Its totient is φ = 92461680.

The previous prime is 138692503. The next prime is 138692563. The reversal of 138692523 is 325296831.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 138692523 - 2⁶ = 138692459 is a prime.

It is a super-2 number, since 2×138692523² = 38471231872211058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138692503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23115418 + ... + 23115423.

It is an arithmetic number, because the mean of its divisors is an integer number (46230842).

Almost surely, 2^138692523 is an apocalyptic number.

138692523 is a deficient number, since it is larger than the sum of its proper divisors (46230845).

138692523 is an equidigital number, since it uses as much as digits as its factorization.

138692523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46230844.

The product of its digits is 77760, while the sum is 39.

The square root of 138692523 is about 11776.7789738960. The cubic root of 138692523 is about 517.6279074250.

The spelling of 138692523 in words is "one hundred thirty-eight million, six hundred ninety-two thousand, five hundred twenty-three".