12997819 has 4 divisors (see below), whose sum is σ = 13210960. Its totient is φ = 12784680.

The previous prime is 12997801. The next prime is 12997847. The reversal of 12997819 is 91879921.

It is a happy number.

12997819 is digitally balanced in base 3, because in such base 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 a de Polignac number, because none of the positive numbers 2^k-12997819 is a prime.

It is a super-2 number, since 2×12997819² = 337886597513522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12997849) 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, 106479 + ... + 106600.

It is an arithmetic number, because the mean of its divisors is an integer number (3302740).

Almost surely, 2^12997819 is an apocalyptic number.

12997819 is a deficient number, since it is larger than the sum of its proper divisors (213141).

12997819 is an equidigital number, since it uses as much as digits as its factorization.

12997819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213140.

The product of its digits is 81648, while the sum is 46.

The square root of 12997819 is about 3605.2488124955. The cubic root of 12997819 is about 235.1203186496.

The spelling of 12997819 in words is "twelve million, nine hundred ninety-seven thousand, eight hundred nineteen".