12219861 has 4 divisors (see below), whose sum is σ = 16293152. Its totient is φ = 8146572.

The previous prime is 12219829. The next prime is 12219871. The reversal of 12219861 is 16891221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 12219861 - 2⁵ = 12219829 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 (12219871) 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, 2036641 + ... + 2036646.

It is an arithmetic number, because the mean of its divisors is an integer number (4073288).

Almost surely, 2^12219861 is an apocalyptic number.

It is an amenable number.

12219861 is a deficient number, since it is larger than the sum of its proper divisors (4073291).

12219861 is an equidigital number, since it uses as much as digits as its factorization.

12219861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4073290.

The product of its digits is 1728, while the sum is 30.

The square root of 12219861 is about 3495.6917770307. The cubic root of 12219861 is about 230.3326063678.

The spelling of 12219861 in words is "twelve million, two hundred nineteen thousand, eight hundred sixty-one".