12591432 has 144 divisors (see below), whose sum is σ = 41081040. Its totient is φ = 3471552.

The previous prime is 12591431. The next prime is 12591443. The reversal of 12591432 is 23419521.

It is a junction number, because it is equal to n+sod(n) for n = 12591396 and 12591405.

It is not an unprimeable number, because it can be changed into a prime (12591431) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 151663 + ... + 151745.

It is an arithmetic number, because the mean of its divisors is an integer number (285285).

Almost surely, 2^12591432 is an apocalyptic number.

12591432 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 12591432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20540520).

12591432 is an abundant number, since it is smaller than the sum of its proper divisors (28489608).

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

12591432 is a wasteful number, since it uses less digits than its factorization.

12591432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152 (or 138 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 12591432 is about 3548.4407843446. The cubic root of 12591432 is about 232.6439206049.

The spelling of 12591432 in words is "twelve million, five hundred ninety-one thousand, four hundred thirty-two".