12499987 has 2 divisors, whose sum is σ = 12499988. Its totient is φ = 12499986.

The previous prime is 12499919. The next prime is 12499999. The reversal of 12499987 is 78999421.

It is a strong prime.

It is an emirp because it is prime and its reverse (78999421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12499987 - 2¹⁹ = 11975699 is a prime.

It is a zygodrome in base 5.

It is a self number, because there is not a number n which added to its sum of digits gives 12499987.

It is not a weakly prime, because it can be changed into another prime (12499187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6249993 + 6249994.

It is an arithmetic number, because the mean of its divisors is an integer number (6249994).

Almost surely, 2^12499987 is an apocalyptic number.

12499987 is a deficient number, since it is larger than the sum of its proper divisors (1).

12499987 is an equidigital number, since it uses as much as digits as its factorization.

12499987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 49.

The square root of 12499987 is about 3535.5320674546. The cubic root of 12499987 is about 232.0793612264.

It can be divided in two parts, 1249 and 9987, that added together give a square (11236 = 106²).

The spelling of 12499987 in words is "twelve million, four hundred ninety-nine thousand, nine hundred eighty-seven".