30518172 has 18 divisors (see below), whose sum is σ = 77143248. Its totient is φ = 10172712.

The previous prime is 30518129. The next prime is 30518177. The reversal of 30518172 is 27181503.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30518177) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 423828 + ... + 423899.

It is an arithmetic number, because the mean of its divisors is an integer number (4285736).

Almost surely, 2^30518172 is an apocalyptic number.

It is an amenable number.

30518172 is an abundant number, since it is smaller than the sum of its proper divisors (46625076).

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

30518172 is a wasteful number, since it uses less digits than its factorization.

30518172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847737 (or 847732 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 30518172 is about 5524.3254791875. The cubic root of 30518172 is about 312.5020270802.

Adding to 30518172 its reverse (27181503), we get a palindrome (57699675).

The spelling of 30518172 in words is "thirty million, five hundred eighteen thousand, one hundred seventy-two".