30005172 has 18 divisors (see below), whose sum is σ = 75846498. Its totient is φ = 10001712.

The previous prime is 30005167. The next prime is 30005189. The reversal of 30005172 is 27150003.

It can be written as a sum of positive squares in only one way, i.e., 26998416 + 3006756 = 5196^2 + 1734^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 416703 + ... + 416774.

Almost surely, 2^30005172 is an apocalyptic number.

It is an amenable number.

30005172 is an abundant number, since it is smaller than the sum of its proper divisors (45841326).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

30005172 is a wasteful number, since it uses less digits than its factorization.

30005172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 833487 (or 833482 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 18.

The square root of 30005172 is about 5477.6976915489. The cubic root of 30005172 is about 310.7411057988.

Adding to 30005172 its reverse (27150003), we get a palindrome (57155175).

The spelling of 30005172 in words is "thirty million, five thousand, one hundred seventy-two".