12432780 has 108 divisors (see below), whose sum is σ = 40229280. Its totient is φ = 3107328.

The previous prime is 12432779. The next prime is 12432809. The reversal of 12432780 is 8723421.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 51901 + ... + 52139.

Almost surely, 2^12432780 is an apocalyptic number.

12432780 is a gapful number since it is divisible by the number (10) 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 12432780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20114640).

12432780 is an abundant number, since it is smaller than the sum of its proper divisors (27796500).

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

12432780 is a wasteful number, since it uses less digits than its factorization.

12432780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288 (or 266 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 12432780 is about 3526.0147475585. The cubic root of 12432780 is about 231.6626835975.

The spelling of 12432780 in words is "twelve million, four hundred thirty-two thousand, seven hundred eighty".