12219397 has 6 divisors (see below), whose sum is σ = 12394482. Its totient is φ = 12046752.

The previous prime is 12219391. The next prime is 12219407. The reversal of 12219397 is 79391221.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1454436 + 10764961 = 1206^2 + 3281^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12219397 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 (12219391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4183 + ... + 6475.

It is an arithmetic number, because the mean of its divisors is an integer number (2065747).

Almost surely, 2^12219397 is an apocalyptic number.

It is an amenable number.

12219397 is a deficient number, since it is larger than the sum of its proper divisors (175085).

12219397 is an frugal number, since it uses more digits than its factorization.

12219397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2439 (or 2366 counting only the distinct ones).

The product of its digits is 6804, while the sum is 34.

The square root of 12219397 is about 3495.6254089934. The cubic root of 12219397 is about 230.3296910133.

The spelling of 12219397 in words is "twelve million, two hundred nineteen thousand, three hundred ninety-seven".