12781870 has 16 divisors (see below), whose sum is σ = 24218640. Its totient is φ = 4843584.

The previous prime is 12781861. The next prime is 12781871. The reversal of 12781870 is 7818721.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12781871) 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, 33447 + ... + 33826.

It is an arithmetic number, because the mean of its divisors is an integer number (1513665).

Almost surely, 2^12781870 is an apocalyptic number.

12781870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12781870 is a deficient number, since it is larger than the sum of its proper divisors (11436770).

12781870 is a wasteful number, since it uses less digits than its factorization.

12781870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67299.

The product of its (nonzero) digits is 6272, while the sum is 34.

The square root of 12781870 is about 3575.1741216338. The cubic root of 12781870 is about 233.8109242854.

The spelling of 12781870 in words is "twelve million, seven hundred eighty-one thousand, eight hundred seventy".