30521172 has 48 divisors (see below), whose sum is σ = 79027200. Its totient is φ = 9089760.

The previous prime is 30521159. The next prime is 30521173. The reversal of 30521172 is 27112503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30521173) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5829 + ... + 9747.

It is an arithmetic number, because the mean of its divisors is an integer number (1646400).

Almost surely, 2^30521172 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30521172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39513600).

30521172 is an abundant number, since it is smaller than the sum of its proper divisors (48506028).

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

30521172 is a wasteful number, since it uses less digits than its factorization.

30521172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3996 (or 3994 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 30521172 is about 5524.5969988769. The cubic root of 30521172 is about 312.5122666118.

Adding to 30521172 its reverse (27112503), we get a palindrome (57633675).

It can be divided in two parts, 3052 and 1172, that added together give a palindrome (4224).

The spelling of 30521172 in words is "thirty million, five hundred twenty-one thousand, one hundred seventy-two".