173309993 has 8 divisors (see below), whose sum is σ = 177879240. Its totient is φ = 168757120.

The previous prime is 173309977. The next prime is 173310013. The reversal of 173309993 is 399903371.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 35200489 + 138109504 = 5933^2 + 11752^2 .

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 173309993 - 2⁴ = 173309977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (173309293) 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, 19043 + ... + 26631.

It is an arithmetic number, because the mean of its divisors is an integer number (22234905).

Almost surely, 2^173309993 is an apocalyptic number.

It is an amenable number.

173309993 is a deficient number, since it is larger than the sum of its proper divisors (4569247).

173309993 is an equidigital number, since it uses as much as digits as its factorization.

173309993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8187.

The product of its (nonzero) digits is 137781, while the sum is 44.

The square root of 173309993 is about 13164.7253294552. The cubic root of 173309993 is about 557.5380796715.

The spelling of 173309993 in words is "one hundred seventy-three million, three hundred nine thousand, nine hundred ninety-three".