12981939 has 4 divisors (see below), whose sum is σ = 17309256. Its totient is φ = 8654624.

The previous prime is 12981911. The next prime is 12981949. The reversal of 12981939 is 93918921.

12981939 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12981939 - 2¹² = 12977843 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12981939.

It is not an unprimeable number, because it can be changed into a prime (12981949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2163654 + ... + 2163659.

It is an arithmetic number, because the mean of its divisors is an integer number (4327314).

Almost surely, 2^12981939 is an apocalyptic number.

12981939 is a deficient number, since it is larger than the sum of its proper divisors (4327317).

12981939 is an equidigital number, since it uses as much as digits as its factorization.

12981939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4327316.

The product of its digits is 34992, while the sum is 42.

The square root of 12981939 is about 3603.0457948797. The cubic root of 12981939 is about 235.0245273932.

The spelling of 12981939 in words is "twelve million, nine hundred eighty-one thousand, nine hundred thirty-nine".