30131712 has 120 divisors (see below), whose sum is σ = 93837744. Its totient is φ = 9252864.

The previous prime is 30131711. The next prime is 30131779. The reversal of 30131712 is 21713103.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30131711) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59653 + ... + 60155.

Almost surely, 2^30131712 is an apocalyptic number.

30131712 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30131712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46918872).

30131712 is an abundant number, since it is smaller than the sum of its proper divisors (63706032).

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

30131712 is a wasteful number, since it uses less digits than its factorization.

30131712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540 (or 521 counting only the distinct ones).

The product of its (nonzero) digits is 126, while the sum is 18.

The square root of 30131712 is about 5489.2360124156. The cubic root of 30131712 is about 311.1773198469.

Adding to 30131712 its reverse (21713103), we get a palindrome (51844815).

The spelling of 30131712 in words is "thirty million, one hundred thirty-one thousand, seven hundred twelve".