12391859 has 4 divisors (see below), whose sum is σ = 12405816. Its totient is φ = 12377904.

The previous prime is 12391831. The next prime is 12391867. The reversal of 12391859 is 95819321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12391859 - 2¹² = 12387763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12393859) 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, 5549 + ... + 7454.

It is an arithmetic number, because the mean of its divisors is an integer number (3101454).

Almost surely, 2^12391859 is an apocalyptic number.

12391859 is a deficient number, since it is larger than the sum of its proper divisors (13957).

12391859 is an equidigital number, since it uses as much as digits as its factorization.

12391859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13956.

The product of its digits is 19440, while the sum is 38.

The square root of 12391859 is about 3520.2072382177. The cubic root of 12391859 is about 231.4082409507.

The spelling of 12391859 in words is "twelve million, three hundred ninety-one thousand, eight hundred fifty-nine".