12231528 has 16 divisors (see below), whose sum is σ = 30578880. Its totient is φ = 4077168.

The previous prime is 12231523. The next prime is 12231539. The reversal of 12231528 is 82513221.

12231528 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×12231528² = 299220554429568, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 509647 = 12231528 / (1 + 2 + 2 + 3 + 1 + 5 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 12231498 and 12231507.

It is not an unprimeable number, because it can be changed into a prime (12231521) 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, 254800 + ... + 254847.

It is an arithmetic number, because the mean of its divisors is an integer number (1911180).

Almost surely, 2^12231528 is an apocalyptic number.

It is an amenable number.

12231528 is an abundant number, since it is smaller than the sum of its proper divisors (18347352).

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

12231528 is a wasteful number, since it uses less digits than its factorization.

12231528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509656 (or 509652 counting only the distinct ones).

The product of its digits is 960, while the sum is 24.

The square root of 12231528 is about 3497.3601473111. The cubic root of 12231528 is about 230.4058869541.

Adding to 12231528 its reverse (82513221), we get a palindrome (94744749).

It can be divided in two parts, 12 and 231528, that added together give a triangular number (231540 = T₆₈₀).

The spelling of 12231528 in words is "twelve million, two hundred thirty-one thousand, five hundred twenty-eight".