12978432 has 108 divisors (see below), whose sum is σ = 38582544. Its totient is φ = 4193280.

The previous prime is 12978431. The next prime is 12978467. The reversal of 12978432 is 23487921.

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

It is not an unprimeable number, because it can be changed into a prime (12978431) 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, 99007 + ... + 99137.

Almost surely, 2^12978432 is an apocalyptic number.

12978432 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 12978432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19291272).

12978432 is an abundant number, since it is smaller than the sum of its proper divisors (25604112).

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

12978432 is a wasteful number, since it uses less digits than its factorization.

12978432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196 (or 179 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 12978432 is about 3602.5590904245. The cubic root of 12978432 is about 235.0033619558.

The spelling of 12978432 in words is "twelve million, nine hundred seventy-eight thousand, four hundred thirty-two".