12820787 has 8 divisors (see below), whose sum is σ = 14674176. Its totient is φ = 10972872.

The previous prime is 12820783. The next prime is 12820789. The reversal of 12820787 is 78702821.

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 12820787 - 2² = 12820783 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12820783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7538 + ... + 9080.

It is an arithmetic number, because the mean of its divisors is an integer number (1834272).

Almost surely, 2^12820787 is an apocalyptic number.

12820787 is a deficient number, since it is larger than the sum of its proper divisors (1853389).

12820787 is a wasteful number, since it uses less digits than its factorization.

12820787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2737.

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 12820787 is about 3580.6126570742. The cubic root of 12820787 is about 234.0479788146.

The spelling of 12820787 in words is "twelve million, eight hundred twenty thousand, seven hundred eighty-seven".