12999987 has 96 divisors (see below), whose sum is σ = 26703360. Its totient is φ = 6065280.

The previous prime is 12999983. The next prime is 12999989. The reversal of 12999987 is 78999921.

It is not a de Polignac number, because 12999987 - 2² = 12999983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12999983) 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 95 ways as a sum of consecutive naturals, for example, 351333 + ... + 351369.

It is an arithmetic number, because the mean of its divisors is an integer number (278160).

Almost surely, 2^12999987 is an apocalyptic number.

12999987 is an abundant number, since it is smaller than the sum of its proper divisors (13703373).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12999987 is a wasteful number, since it uses less digits than its factorization.

12999987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90 (or 71 counting only the distinct ones).

The product of its digits is 734832, while the sum is 54.

The square root of 12999987 is about 3605.5494726879. The cubic root of 12999987 is about 235.1333903942.

It can be divided in two parts, 12 and 999987, that added together give a palindrome (999999).

The spelling of 12999987 in words is "twelve million, nine hundred ninety-nine thousand, nine hundred eighty-seven".