30505172 has 12 divisors (see below), whose sum is σ = 53439456. Its totient is φ = 15236760.

The previous prime is 30505169. The next prime is 30505213. The reversal of 30505172 is 27150503.

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 1097 + ... + 7887.

It is an arithmetic number, because the mean of its divisors is an integer number (4453288).

Almost surely, 2^30505172 is an apocalyptic number.

It is an amenable number.

30505172 is a deficient number, since it is larger than the sum of its proper divisors (22934284).

30505172 is a wasteful number, since it uses less digits than its factorization.

30505172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7918 (or 7916 counting only the distinct ones).

The product of its (nonzero) digits is 1050, while the sum is 23.

The square root of 30505172 is about 5523.1487396231. The cubic root of 30505172 is about 312.4576480205.

Adding to 30505172 its reverse (27150503), we get a palindrome (57655675).

The spelling of 30505172 in words is "thirty million, five hundred five thousand, one hundred seventy-two".