12845639 has 2 divisors, whose sum is σ = 12845640. Its totient is φ = 12845638.

The previous prime is 12845611. The next prime is 12845641. The reversal of 12845639 is 93654821.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12845639 - 2⁸ = 12845383 is a prime.

Together with 12845641, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12845839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6422819 + 6422820.

It is an arithmetic number, because the mean of its divisors is an integer number (6422820).

Almost surely, 2^12845639 is an apocalyptic number.

12845639 is a deficient number, since it is larger than the sum of its proper divisors (1).

12845639 is an equidigital number, since it uses as much as digits as its factorization.

12845639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 38.

The square root of 12845639 is about 3584.0813327825. The cubic root of 12845639 is about 234.1991085413.

The spelling of 12845639 in words is "twelve million, eight hundred forty-five thousand, six hundred thirty-nine".