12861867 has 4 divisors (see below), whose sum is σ = 17149160. Its totient is φ = 8574576.

The previous prime is 12861857. The next prime is 12861887. The reversal of 12861867 is 76816821.

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

It is not a de Polignac number, because 12861867 - 2¹⁰ = 12860843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12861817) 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, 2143642 + ... + 2143647.

It is an arithmetic number, because the mean of its divisors is an integer number (4287290).

Almost surely, 2^12861867 is an apocalyptic number.

12861867 is a deficient number, since it is larger than the sum of its proper divisors (4287293).

12861867 is an equidigital number, since it uses as much as digits as its factorization.

12861867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4287292.

The product of its digits is 32256, while the sum is 39.

The square root of 12861867 is about 3586.3445177506. The cubic root of 12861867 is about 234.2976889187.

The spelling of 12861867 in words is "twelve million, eight hundred sixty-one thousand, eight hundred sixty-seven".