12400222 has 4 divisors (see below), whose sum is σ = 18600336. Its totient is φ = 6200110.

The previous prime is 12400183. The next prime is 12400231. The reversal of 12400222 is 22200421.

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

It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3100054 + ... + 3100057.

It is an arithmetic number, because the mean of its divisors is an integer number (4650084).

Almost surely, 2^12400222 is an apocalyptic number.

12400222 is a deficient number, since it is larger than the sum of its proper divisors (6200114).

12400222 is an equidigital number, since it uses as much as digits as its factorization.

12400222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6200113.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 12400222 is about 3521.3948940725. The cubic root of 12400222 is about 231.4602867314.

Adding to 12400222 its reverse (22200421), we get a palindrome (34600643).

The spelling of 12400222 in words is "twelve million, four hundred thousand, two hundred twenty-two".