12820919 has 8 divisors (see below), whose sum is σ = 13229808. Its totient is φ = 12418560.

The previous prime is 12820909. The next prime is 12820937. The reversal of 12820919 is 91902821.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 12820919 - 2¹⁶ = 12755383 is a prime.

It is a super-2 number, since 2×12820919² = 328751928009122, 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 (12820909) 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 7 ways as a sum of consecutive naturals, for example, 2519 + ... + 5655.

It is an arithmetic number, because the mean of its divisors is an integer number (1653726).

Almost surely, 2^12820919 is an apocalyptic number.

12820919 is a deficient number, since it is larger than the sum of its proper divisors (408889).

12820919 is an equidigital number, since it uses as much as digits as its factorization.

12820919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3265.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 12820919 is about 3580.6310896265. The cubic root of 12820919 is about 234.0487820473.

The spelling of 12820919 in words is "twelve million, eight hundred twenty thousand, nine hundred nineteen".