12972640 has 48 divisors (see below), whose sum is σ = 31026240. Its totient is φ = 5125120.

The previous prime is 12972637. The next prime is 12972671. The reversal of 12972640 is 4627921.

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, 13785 + ... + 14695.

It is an arithmetic number, because the mean of its divisors is an integer number (646380).

Almost surely, 2^12972640 is an apocalyptic number.

12972640 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 12972640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15513120).

12972640 is an abundant number, since it is smaller than the sum of its proper divisors (18053600).

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

12972640 is an equidigital number, since it uses as much as digits as its factorization.

12972640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1015 (or 1007 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 12972640 is about 3601.7551277120. The cubic root of 12972640 is about 234.9683977422.

The spelling of 12972640 in words is "twelve million, nine hundred seventy-two thousand, six hundred forty".