12820087 has 4 divisors (see below), whose sum is σ = 14651536. Its totient is φ = 10988640.

The previous prime is 12820061. The next prime is 12820099. The reversal of 12820087 is 78002821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12820087 - 2⁷ = 12819959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12820037) 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, 915714 + ... + 915727.

It is an arithmetic number, because the mean of its divisors is an integer number (3662884).

Almost surely, 2^12820087 is an apocalyptic number.

12820087 is a deficient number, since it is larger than the sum of its proper divisors (1831449).

12820087 is an equidigital number, since it uses as much as digits as its factorization.

12820087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1831448.

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 12820087 is about 3580.5149071048. The cubic root of 12820087 is about 234.0437191549.

The spelling of 12820087 in words is "twelve million, eight hundred twenty thousand, eighty-seven".