12981647 has 8 divisors (see below), whose sum is σ = 15348000. Its totient is φ = 10743264.

The previous prime is 12981643. The next prime is 12981649. The reversal of 12981647 is 74618921.

12981647 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12981647 - 2² = 12981643 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12981647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12981643) 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, 31772 + ... + 32177.

It is an arithmetic number, because the mean of its divisors is an integer number (1918500).

Almost surely, 2^12981647 is an apocalyptic number.

12981647 is a deficient number, since it is larger than the sum of its proper divisors (2366353).

12981647 is an equidigital number, since it uses as much as digits as its factorization.

12981647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63985.

The product of its digits is 24192, while the sum is 38.

The square root of 12981647 is about 3603.0052733794. The cubic root of 12981647 is about 235.0227652610.

Subtracting from 12981647 its sum of digits (38), we obtain a square (12981609 = 3603²).

The spelling of 12981647 in words is "twelve million, nine hundred eighty-one thousand, six hundred forty-seven".