12939881 has 4 divisors (see below), whose sum is σ = 13014852. Its totient is φ = 12864912.

The previous prime is 12939859. The next prime is 12939889. The reversal of 12939881 is 18893921.

12939881 is digitally balanced in base 2 and base 3, 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, and also an emirpimes, since its reverse is a distinct semiprime: 18893921 = 1489 ⋅12689.

It can be written as a sum of positive squares in 2 ways, for example, as 5736025 + 7203856 = 2395^2 + 2684^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12939881 is a prime.

It is a super-2 number, since 2×12939881² = 334881040588322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12939889) 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, 37226 + ... + 37571.

It is an arithmetic number, because the mean of its divisors is an integer number (3253713).

Almost surely, 2^12939881 is an apocalyptic number.

It is an amenable number.

12939881 is a deficient number, since it is larger than the sum of its proper divisors (74971).

12939881 is an equidigital number, since it uses as much as digits as its factorization.

12939881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74970.

The product of its digits is 31104, while the sum is 41.

The square root of 12939881 is about 3597.2046091375. The cubic root of 12939881 is about 234.7704473368.

The spelling of 12939881 in words is "twelve million, nine hundred thirty-nine thousand, eight hundred eighty-one".