12661887 has 8 divisors (see below), whose sum is σ = 19294336. Its totient is φ = 7235352.

The previous prime is 12661879. The next prime is 12661903. The reversal of 12661887 is 78816621.

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

It is not a de Polignac number, because 12661887 - 2³ = 12661879 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 (12661837) 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, 301453 + ... + 301494.

It is an arithmetic number, because the mean of its divisors is an integer number (2411792).

Almost surely, 2^12661887 is an apocalyptic number.

12661887 is a deficient number, since it is larger than the sum of its proper divisors (6632449).

12661887 is an equidigital number, since it uses as much as digits as its factorization.

12661887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 602957.

The product of its digits is 32256, while the sum is 39.

The square root of 12661887 is about 3558.3545354560. The cubic root of 12661887 is about 233.0770312697.

The spelling of 12661887 in words is "twelve million, six hundred sixty-one thousand, eight hundred eighty-seven".