12400987 has 2 divisors, whose sum is σ = 12400988. Its totient is φ = 12400986.

The previous prime is 12400981. The next prime is 12401027. The reversal of 12400987 is 78900421.

12400987 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (78900421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12400987 - 2⁷ = 12400859 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12400981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6200493 + 6200494.

It is an arithmetic number, because the mean of its divisors is an integer number (6200494).

Almost surely, 2^12400987 is an apocalyptic number.

12400987 is a deficient number, since it is larger than the sum of its proper divisors (1).

12400987 is an equidigital number, since it uses as much as digits as its factorization.

12400987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 12400987 is about 3521.5035141257. The cubic root of 12400987 is about 231.4650464171.

The spelling of 12400987 in words is "twelve million, four hundred thousand, nine hundred eighty-seven".