12820997 has 8 divisors (see below), whose sum is σ = 14952000. Its totient is φ = 10989132.

The previous prime is 12820979. The next prime is 12821021. The reversal of 12820997 is 79902821.

It is not a de Polignac number, because 12820997 - 2¹⁶ = 12755461 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12820997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12820937) 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, 18347 + ... + 19032.

It is an arithmetic number, because the mean of its divisors is an integer number (1869000).

Almost surely, 2^12820997 is an apocalyptic number.

It is an amenable number.

12820997 is a deficient number, since it is larger than the sum of its proper divisors (2131003).

12820997 is an frugal number, since it uses more digits than its factorization.

12820997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37400 (or 37386 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 12820997 is about 3580.6419815447. The cubic root of 12820997 is about 234.0492566822.

The spelling of 12820997 in words is "twelve million, eight hundred twenty thousand, nine hundred ninety-seven".