12539772 has 144 divisors (see below), whose sum is σ = 39952640. Its totient is φ = 3359232.

The previous prime is 12539771. The next prime is 12539777. The reversal of 12539772 is 27793521.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12539771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 129228 + ... + 129324.

Almost surely, 2^12539772 is an apocalyptic number.

12539772 is a gapful number since it is divisible by the number (12) 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 12539772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19976320).

12539772 is an abundant number, since it is smaller than the sum of its proper divisors (27412868).

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

12539772 is a wasteful number, since it uses less digits than its factorization.

12539772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142 (or 128 counting only the distinct ones).

The product of its digits is 26460, while the sum is 36.

The square root of 12539772 is about 3541.1540491766. The cubic root of 12539772 is about 232.3253214494.

It can be divided in two parts, 1253 and 9772, that added together give a square (11025 = 105²).

The spelling of 12539772 in words is "twelve million, five hundred thirty-nine thousand, seven hundred seventy-two".