173389906 has 4 divisors (see below), whose sum is σ = 260084862. Its totient is φ = 86694952.

The previous prime is 173389841. The next prime is 173389973. The reversal of 173389906 is 609983371.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 609983371 = 1613 ⋅378167.

It can be written as a sum of positive squares in only one way, i.e., 120231225 + 53158681 = 10965^2 + 7291^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43347475 + ... + 43347478.

Almost surely, 2^173389906 is an apocalyptic number.

173389906 is a deficient number, since it is larger than the sum of its proper divisors (86694956).

173389906 is an equidigital number, since it uses as much as digits as its factorization.

173389906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86694955.

The product of its (nonzero) digits is 244944, while the sum is 46.

The square root of 173389906 is about 13167.7600980577. The cubic root of 173389906 is about 557.6237598517.

The spelling of 173389906 in words is "one hundred seventy-three million, three hundred eighty-nine thousand, nine hundred six".