12219994 has 4 divisors (see below), whose sum is σ = 18329994. Its totient is φ = 6109996.

The previous prime is 12219973. The next prime is 12219997. The reversal of 12219994 is 49991221.

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

It can be written as a sum of positive squares in only one way, i.e., 11471769 + 748225 = 3387^2 + 865^2 .

It is not an unprimeable number, because it can be changed into a prime (12219997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3054997 + ... + 3055000.

Almost surely, 2^12219994 is an apocalyptic number.

12219994 is a deficient number, since it is larger than the sum of its proper divisors (6110000).

12219994 is an equidigital number, since it uses as much as digits as its factorization.

12219994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6109999.

The product of its digits is 11664, while the sum is 37.

The square root of 12219994 is about 3495.7108003953. The cubic root of 12219994 is about 230.3334420054. Note that the first 3 decimals are identical.

The spelling of 12219994 in words is "twelve million, two hundred nineteen thousand, nine hundred ninety-four".