12663885 has 32 divisors (see below), whose sum is σ = 22071168. Its totient is φ = 6163200.

The previous prime is 12663883. The next prime is 12663913. The reversal of 12663885 is 58836621.

12663885 = 143² + 144² + ... + 344².

It is a happy number.

It is not a de Polignac number, because 12663885 - 2¹ = 12663883 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12663881) 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 31 ways as a sum of consecutive naturals, for example, 19374 + ... + 20016.

It is an arithmetic number, because the mean of its divisors is an integer number (689724).

Almost surely, 2^12663885 is an apocalyptic number.

12663885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12663885 is a deficient number, since it is larger than the sum of its proper divisors (9407283).

12663885 is a wasteful number, since it uses less digits than its factorization.

12663885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765.

The product of its digits is 69120, while the sum is 39.

The square root of 12663885 is about 3558.6352721233. The cubic root of 12663885 is about 233.0892901959.

It can be divided in two parts, 1266 and 3885, that added together give a triangular number (5151 = T₁₀₁).

The spelling of 12663885 in words is "twelve million, six hundred sixty-three thousand, eight hundred eighty-five".