12655440 has 280 divisors, whose sum is σ = 52044288. Its totient is φ = 2799360.

The previous prime is 12655439. The next prime is 12655457. The reversal of 12655440 is 4455621.

12655440 is a `hidden beast` number, since 1 + 2 + 655 + 4 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (280).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 408225 + ... + 408255.

Almost surely, 2^12655440 is an apocalyptic number.

12655440 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 12655440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26022144).

12655440 is an abundant number, since it is smaller than the sum of its proper divisors (39388848).

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

12655440 is an equidigital number, since it uses as much as digits as its factorization.

12655440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69 (or 48 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 12655440 is about 3557.4485238721. The cubic root of 12655440 is about 233.0374662685.

The spelling of 12655440 in words is "twelve million, six hundred fifty-five thousand, four hundred forty".