12811939 has 8 divisors (see below), whose sum is σ = 15147360. Its totient is φ = 10602816.

The previous prime is 12811937. The next prime is 12811957. The reversal of 12811939 is 93911821.

12811939 is nontrivially palindromic in base 6.

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

It is not a de Polignac number, because 12811939 - 2¹ = 12811937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12811933) 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, 31354 + ... + 31759.

It is an arithmetic number, because the mean of its divisors is an integer number (1893420).

Almost surely, 2^12811939 is an apocalyptic number.

12811939 is a deficient number, since it is larger than the sum of its proper divisors (2335421).

12811939 is an equidigital number, since it uses as much as digits as its factorization.

12811939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63149.

The product of its digits is 3888, while the sum is 34.

The square root of 12811939 is about 3579.3769010821. The cubic root of 12811939 is about 233.9941253060.

The spelling of 12811939 in words is "twelve million, eight hundred eleven thousand, nine hundred thirty-nine".