12987929 has 4 divisors (see below), whose sum is σ = 13025076. Its totient is φ = 12950784.

The previous prime is 12987917. The next prime is 12987967. The reversal of 12987929 is 92978921.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2715904 + 10272025 = 1648^2 + 3205^2 .

It is a cyclic number.

It is not a de Polignac number, because 12987929 - 2¹² = 12983833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12987229) 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 3 ways as a sum of consecutive naturals, for example, 18044 + ... + 18749.

It is an arithmetic number, because the mean of its divisors is an integer number (3256269).

Almost surely, 2^12987929 is an apocalyptic number.

It is an amenable number.

12987929 is a deficient number, since it is larger than the sum of its proper divisors (37147).

12987929 is an equidigital number, since it uses as much as digits as its factorization.

12987929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37146.

The product of its digits is 163296, while the sum is 47.

The square root of 12987929 is about 3603.8769401854. The cubic root of 12987929 is about 235.0606694120.

The spelling of 12987929 in words is "twelve million, nine hundred eighty-seven thousand, nine hundred twenty-nine".