30120172 has 12 divisors (see below), whose sum is σ = 53378080. Its totient is φ = 14869296.

The previous prime is 30120169. The next prime is 30120173. The reversal of 30120172 is 27102103.

It is a happy number.

It is a super-2 number, since 2×30120172² = 1814449522619168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (30120173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47343 + ... + 47974.

Almost surely, 2^30120172 is an apocalyptic number.

It is an amenable number.

30120172 is a deficient number, since it is larger than the sum of its proper divisors (23257908).

30120172 is a wasteful number, since it uses less digits than its factorization.

30120172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95400 (or 95398 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 30120172 is about 5488.1847636536. The cubic root of 30120172 is about 311.1375893375.

Adding to 30120172 its reverse (27102103), we get a palindrome (57222275).

The spelling of 30120172 in words is "thirty million, one hundred twenty thousand, one hundred seventy-two".