12432591 has 12 divisors (see below), whose sum is σ = 18026632. Its totient is φ = 8256816.

The previous prime is 12432583. The next prime is 12432601. The reversal of 12432591 is 19523421.

12432591 is a nontrivial binomial coefficient, being equal to C(4987, 2).

It is not a de Polignac number, because 12432591 - 2³ = 12432583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12432521) 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, 1 + ... + 4986.

Almost surely, 2^12432591 is an apocalyptic number.

12432591 is the 4986-th triangular number.

12432591 is a deficient number, since it is larger than the sum of its proper divisors (5594041).

12432591 is a wasteful number, since it uses less digits than its factorization.

12432591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5270 (or 5267 counting only the distinct ones).

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

The square root of 12432591 is about 3525.9879466612. The cubic root of 12432591 is about 231.6615096989.

The spelling of 12432591 in words is "twelve million, four hundred thirty-two thousand, five hundred ninety-one".