12755440 has 80 divisors (see below), whose sum is σ = 32060448. Its totient is φ = 4702208.

The previous prime is 12755437. The next prime is 12755453. The reversal of 12755440 is 4455721.

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

It is a junction number, because it is equal to n+sod(n) for n = 12755399 and 12755408.

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, 112824 + ... + 112936.

Almost surely, 2^12755440 is an apocalyptic number.

12755440 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 12755440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16030224).

12755440 is an abundant number, since it is smaller than the sum of its proper divisors (19305008).

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

12755440 is a wasteful number, since it uses less digits than its factorization.

12755440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 28.

The square root of 12755440 is about 3571.4758854009. The cubic root of 12755440 is about 233.6496571422.

The spelling of 12755440 in words is "twelve million, seven hundred fifty-five thousand, four hundred forty".