12765840 has 80 divisors (see below), whose sum is σ = 40527168. Its totient is φ = 3322368.

The previous prime is 12765839. The next prime is 12765877. The reversal of 12765840 is 4856721.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9702 + ... + 10938.

Almost surely, 2^12765840 is an apocalyptic number.

12765840 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 12765840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20263584).

12765840 is an abundant number, since it is smaller than the sum of its proper divisors (27761328).

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

12765840 is a wasteful number, since it uses less digits than its factorization.

12765840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1296 (or 1290 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 12765840 is about 3572.9315694539. The cubic root of 12765840 is about 233.7131410707.

The spelling of 12765840 in words is "twelve million, seven hundred sixty-five thousand, eight hundred forty".