12789640 has 32 divisors (see below), whose sum is σ = 29393280. Its totient is φ = 5006272.

The previous prime is 12789631. The next prime is 12789649. The reversal of 12789640 is 4698721.

It is an interprime number because it is at equal distance from previous prime (12789631) and next prime (12789649).

It is a self number, because there is not a number n which added to its sum of digits gives 12789640.

It is not an unprimeable number, because it can be changed into a prime (12789649) 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, 1522 + ... + 5281.

It is an arithmetic number, because the mean of its divisors is an integer number (918540).

Almost surely, 2^12789640 is an apocalyptic number.

12789640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12789640 is an abundant number, since it is smaller than the sum of its proper divisors (16603640).

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

12789640 is a wasteful number, since it uses less digits than its factorization.

12789640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6861 (or 6857 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 12789640 is about 3576.2606169014. The cubic root of 12789640 is about 233.8582919733.

The spelling of 12789640 in words is "twelve million, seven hundred eighty-nine thousand, six hundred forty".