12723440 has 40 divisors (see below), whose sum is σ = 29931120. Its totient is φ = 5029376.

The previous prime is 12723433. The next prime is 12723443. The reversal of 12723440 is 4432721.

12723440 is nontrivially palindromic in base 13.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12723443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6227 + ... + 8013.

It is an arithmetic number, because the mean of its divisors is an integer number (748278).

Almost surely, 2^12723440 is an apocalyptic number.

12723440 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 12723440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14965560).

12723440 is an abundant number, since it is smaller than the sum of its proper divisors (17207680).

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

12723440 is a wasteful number, since it uses less digits than its factorization.

12723440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1889 (or 1883 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 12723440 is about 3566.9931314764. The cubic root of 12723440 is about 233.4541052788.

The spelling of 12723440 in words is "twelve million, seven hundred twenty-three thousand, four hundred forty".