12649987 has 12 divisors (see below), whose sum is σ = 14996016. Its totient is φ = 10636080.

The previous prime is 12649979. The next prime is 12649993. The reversal of 12649987 is 78994621.

12649987 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12649987 - 2³ = 12649979 is a prime.

It is a super-2 number, since 2×12649987² = 320044342200338, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12649907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 162 + ... + 5032.

It is an arithmetic number, because the mean of its divisors is an integer number (1249668).

Almost surely, 2^12649987 is an apocalyptic number.

12649987 is a deficient number, since it is larger than the sum of its proper divisors (2346029).

12649987 is an equidigital number, since it uses as much as digits as its factorization.

12649987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4938 (or 4931 counting only the distinct ones).

The product of its digits is 217728, while the sum is 46.

The square root of 12649987 is about 3556.6820212102. The cubic root of 12649987 is about 233.0039909182.

The spelling of 12649987 in words is "twelve million, six hundred forty-nine thousand, nine hundred eighty-seven".