39138523 has 8 divisors (see below), whose sum is σ = 40553856. Its totient is φ = 37732800.

The previous prime is 39138497. The next prime is 39138527. The reversal of 39138523 is 32583193.

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

It is a cyclic number.

It is not a de Polignac number, because 39138523 - 2²¹ = 37041371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39138527) 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, 6465 + ... + 10957.

It is an arithmetic number, because the mean of its divisors is an integer number (5069232).

Almost surely, 2^39138523 is an apocalyptic number.

39138523 is a deficient number, since it is larger than the sum of its proper divisors (1415333).

39138523 is a wasteful number, since it uses less digits than its factorization.

39138523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4805.

The product of its digits is 19440, while the sum is 34.

The square root of 39138523 is about 6256.0788837738. The cubic root of 39138523 is about 339.5221748150.

The spelling of 39138523 in words is "thirty-nine million, one hundred thirty-eight thousand, five hundred twenty-three".