12635989 has 2 divisors, whose sum is σ = 12635990. Its totient is φ = 12635988.

The previous prime is 12635977. The next prime is 12636017. The reversal of 12635989 is 98953621.

It is a happy number.

12635989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12602500 + 33489 = 3550^2 + 183^2 .

It is a cyclic number.

It is not a de Polignac number, because 12635989 - 2¹⁵ = 12603221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12635929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6317994 + 6317995.

It is an arithmetic number, because the mean of its divisors is an integer number (6317995).

Almost surely, 2^12635989 is an apocalyptic number.

It is an amenable number.

12635989 is a deficient number, since it is larger than the sum of its proper divisors (1).

12635989 is an equidigital number, since it uses as much as digits as its factorization.

12635989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 43.

The square root of 12635989 is about 3554.7136312226. The cubic root of 12635989 is about 232.9180147124.

The spelling of 12635989 in words is "twelve million, six hundred thirty-five thousand, nine hundred eighty-nine".