12745440 has 144 divisors (see below), whose sum is σ = 44579808. Its totient is φ = 3314688.

The previous prime is 12745399. The next prime is 12745483. The reversal of 12745440 is 4454721.

It is a tau number, because it is divible by the number of its divisors (144).

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 23 ways as a sum of consecutive naturals, for example, 76237 + ... + 76403.

It is an arithmetic number, because the mean of its divisors is an integer number (309582).

Almost surely, 2^12745440 is an apocalyptic number.

12745440 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 12745440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22289904).

12745440 is an abundant number, since it is smaller than the sum of its proper divisors (31834368).

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

12745440 is a wasteful number, since it uses less digits than its factorization.

12745440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241 (or 230 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 27.

The square root of 12745440 is about 3570.0756294510. The cubic root of 12745440 is about 233.5885823531.

The spelling of 12745440 in words is "twelve million, seven hundred forty-five thousand, four hundred forty".