138407523 has 8 divisors (see below), whose sum is σ = 195398928. Its totient is φ = 86843904.

The previous prime is 138407509. The next prime is 138407531. The reversal of 138407523 is 325704831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 138407523 - 2⁹ = 138407011 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138403523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1356886 + ... + 1356987.

It is an arithmetic number, because the mean of its divisors is an integer number (24424866).

Almost surely, 2^138407523 is an apocalyptic number.

138407523 is a deficient number, since it is larger than the sum of its proper divisors (56991405).

138407523 is a wasteful number, since it uses less digits than its factorization.

138407523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2713893.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 138407523 is about 11764.6726686296. The cubic root of 138407523 is about 517.2731055097.

The spelling of 138407523 in words is "one hundred thirty-eight million, four hundred seven thousand, five hundred twenty-three".