30723173 has 8 divisors (see below), whose sum is σ = 33299448. Its totient is φ = 28177344.

The previous prime is 30723169. The next prime is 30723181. The reversal of 30723173 is 37132703.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4169764 + 26553409 = 2042^2 + 5153^2 .

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

It is not a de Polignac number, because 30723173 - 2² = 30723169 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30723103) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 5486 + ... + 9567.

It is an arithmetic number, because the mean of its divisors is an integer number (4162431).

Almost surely, 2^30723173 is an apocalyptic number.

It is an amenable number.

30723173 is a deficient number, since it is larger than the sum of its proper divisors (2576275).

30723173 is a wasteful number, since it uses less digits than its factorization.

30723173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15223.

The product of its (nonzero) digits is 2646, while the sum is 26.

The square root of 30723173 is about 5542.8488162677. The cubic root of 30723173 is about 313.2001937999.

Adding to 30723173 its reverse (37132703), we get a palindrome (67855876).

The spelling of 30723173 in words is "thirty million, seven hundred twenty-three thousand, one hundred seventy-three".