30172873 has 4 divisors (see below), whose sum is σ = 30257280. Its totient is φ = 30088468.

The previous prime is 30172867. The next prime is 30172903. The reversal of 30172873 is 37827103.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30172873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30172273) 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 3 ways as a sum of consecutive naturals, for example, 41665 + ... + 42382.

It is an arithmetic number, because the mean of its divisors is an integer number (7564320).

Almost surely, 2^30172873 is an apocalyptic number.

It is an amenable number.

30172873 is a deficient number, since it is larger than the sum of its proper divisors (84407).

30172873 is an equidigital number, since it uses as much as digits as its factorization.

30172873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84406.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 30172873 is about 5492.9839795871. The cubic root of 30172873 is about 311.3189485055.

Adding to 30172873 its reverse (37827103), we get a palindrome (67999976).

The spelling of 30172873 in words is "thirty million, one hundred seventy-two thousand, eight hundred seventy-three".