12923981 has 4 divisors (see below), whose sum is σ = 14770272. Its totient is φ = 11077692.

The previous prime is 12923947. The next prime is 12923983. The reversal of 12923981 is 18932921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18932921 = 7 ⋅2704703.

It is a cyclic number.

It is not a de Polignac number, because 12923981 - 2¹⁸ = 12661837 is a prime.

It is a super-2 number, since 2×12923981² = 334058569776722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12923983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 923135 + ... + 923148.

It is an arithmetic number, because the mean of its divisors is an integer number (3692568).

Almost surely, 2^12923981 is an apocalyptic number.

It is an amenable number.

12923981 is a deficient number, since it is larger than the sum of its proper divisors (1846291).

12923981 is an equidigital number, since it uses as much as digits as its factorization.

12923981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1846290.

The product of its digits is 7776, while the sum is 35.

The square root of 12923981 is about 3594.9938803842. The cubic root of 12923981 is about 234.6742491291.

The spelling of 12923981 in words is "twelve million, nine hundred twenty-three thousand, nine hundred eighty-one".