12787440 has 40 divisors (see below), whose sum is σ = 39641808. Its totient is φ = 3409920.

The previous prime is 12787429. The next prime is 12787441. The reversal of 12787440 is 4478721.

12787440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 (12787441) 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, 26401 + ... + 26880.

Almost surely, 2^12787440 is an apocalyptic number.

12787440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12787440 is an abundant number, since it is smaller than the sum of its proper divisors (26854368).

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

12787440 is a wasteful number, since it uses less digits than its factorization.

12787440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53297 (or 53291 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 33.

The square root of 12787440 is about 3575.9530198256. The cubic root of 12787440 is about 233.8448822202.

The spelling of 12787440 in words is "twelve million, seven hundred eighty-seven thousand, four hundred forty".