12432640 has 72 divisors (see below), whose sum is σ = 32524128. Its totient is φ = 4515840.

The previous prime is 12432601. The next prime is 12432683. The reversal of 12432640 is 4623421.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13639 + ... + 14521.

It is an arithmetic number, because the mean of its divisors is an integer number (451724).

Almost surely, 2^12432640 is an apocalyptic number.

12432640 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 12432640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16262064).

12432640 is an abundant number, since it is smaller than the sum of its proper divisors (20091488).

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

12432640 is an equidigital number, since it uses as much as digits as its factorization.

12432640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 915 (or 901 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 12432640 is about 3525.9948950615. The cubic root of 12432640 is about 231.6618140442.

It can be divided in two parts, 1243 and 2640, that added together give a palindrome (3883).

The spelling of 12432640 in words is "twelve million, four hundred thirty-two thousand, six hundred forty".