139518023 has 8 divisors (see below), whose sum is σ = 145850208. Its totient is φ = 133208064.

The previous prime is 139518019. The next prime is 139518077. The reversal of 139518023 is 320815931.

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 139518023 - 2² = 139518019 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 (139518523) 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, 8015 + ... + 18527.

It is an arithmetic number, because the mean of its divisors is an integer number (18231276).

Almost surely, 2^139518023 is an apocalyptic number.

139518023 is a deficient number, since it is larger than the sum of its proper divisors (6332185).

139518023 is a wasteful number, since it uses less digits than its factorization.

139518023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11113.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 139518023 is about 11811.7747608054. The cubic root of 139518023 is about 518.6528529942.

The spelling of 139518023 in words is "one hundred thirty-nine million, five hundred eighteen thousand, twenty-three".