12981739 has 4 divisors (see below), whose sum is σ = 12993624. Its totient is φ = 12969856.

The previous prime is 12981737. The next prime is 12981751. The reversal of 12981739 is 93718921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93718921 = 31 ⋅3023191.

It is a cyclic number.

It is not a de Polignac number, because 12981739 - 2¹ = 12981737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12981733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4117 + ... + 6550.

It is an arithmetic number, because the mean of its divisors is an integer number (3248406).

Almost surely, 2^12981739 is an apocalyptic number.

12981739 is a deficient number, since it is larger than the sum of its proper divisors (11885).

12981739 is a wasteful number, since it uses less digits than its factorization.

12981739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11884.

The product of its digits is 27216, while the sum is 40.

The square root of 12981739 is about 3603.0180404766. The cubic root of 12981739 is about 235.0233204562.

It can be divided in two parts, 12981 and 739, that multiplied together give a palindrome (9592959).

The spelling of 12981739 in words is "twelve million, nine hundred eighty-one thousand, seven hundred thirty-nine".