173638139 has 4 divisors (see below), whose sum is σ = 173664600. Its totient is φ = 173611680.

The previous prime is 173638117. The next prime is 173638159. The reversal of 173638139 is 931836371.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 931836371 = 3677 ⋅253423.

It is a cyclic number.

It is not a de Polignac number, because 173638139 - 2⁸ = 173637883 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 173638096 and 173638105.

It is not an unprimeable number, because it can be changed into a prime (173638159) 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, 4844 + ... + 19254.

It is an arithmetic number, because the mean of its divisors is an integer number (43416150).

Almost surely, 2^173638139 is an apocalyptic number.

173638139 is a deficient number, since it is larger than the sum of its proper divisors (26461).

173638139 is a wasteful number, since it uses less digits than its factorization.

173638139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26460.

The product of its digits is 81648, while the sum is 41.

The square root of 173638139 is about 13177.1825137242. The cubic root of 173638139 is about 557.8897396080.

The spelling of 173638139 in words is "one hundred seventy-three million, six hundred thirty-eight thousand, one hundred thirty-nine".