12909863 has 4 divisors (see below), whose sum is σ = 12936648. Its totient is φ = 12883080.

The previous prime is 12909839. The next prime is 12909887. The reversal of 12909863 is 36890921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36890921 = 1217 ⋅30313.

It is an interprime number because it is at equal distance from previous prime (12909839) and next prime (12909887).

It is a cyclic number.

It is not a de Polignac number, because 12909863 - 2²² = 8715559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12909833) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12656 + ... + 13637.

It is an arithmetic number, because the mean of its divisors is an integer number (3234162).

Almost surely, 2^12909863 is an apocalyptic number.

12909863 is a deficient number, since it is larger than the sum of its proper divisors (26785).

12909863 is an equidigital number, since it uses as much as digits as its factorization.

12909863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26784.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 12909863 is about 3593.0297800046. The cubic root of 12909863 is about 234.5887662274.

The spelling of 12909863 in words is "twelve million, nine hundred nine thousand, eight hundred sixty-three".