12917870 has 48 divisors (see below), whose sum is σ = 27751248. Its totient is φ = 4314240.

The previous prime is 12917833. The next prime is 12917939. The reversal of 12917870 is 7871921.

12917870 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 12917870.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19769 + ... + 20411.

It is an arithmetic number, because the mean of its divisors is an integer number (578151).

Almost surely, 2^12917870 is an apocalyptic number.

12917870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12917870 is an abundant number, since it is smaller than the sum of its proper divisors (14833378).

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

12917870 is a wasteful number, since it uses less digits than its factorization.

12917870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705 (or 698 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 35.

The square root of 12917870 is about 3594.1438479838. The cubic root of 12917870 is about 234.6372553568.

The spelling of 12917870 in words is "twelve million, nine hundred seventeen thousand, eight hundred seventy".