1222638 has 8 divisors (see below), whose sum is σ = 2445288. Its totient is φ = 407544.

The previous prime is 1222633. The next prime is 1222643. The reversal of 1222638 is 8362221.

It is an interprime number because it is at equal distance from previous prime (1222633) and next prime (1222643).

It is a sphenic number, since it is the product of 3 distinct primes.

1222638 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101881 + ... + 101892.

It is an arithmetic number, because the mean of its divisors is an integer number (305661).

2^1222638 is an apocalyptic number.

1222638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1222638 is a wasteful number, since it uses less digits than its factorization.

1222638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203778.

The product of its digits is 1152, while the sum is 24.

The square root of 1222638 is about 1105.7296233709. The cubic root of 1222638 is about 106.9299334571.

Adding to 1222638 its reverse (8362221), we get a palindrome (9584859).

The spelling of 1222638 in words is "one million, two hundred twenty-two thousand, six hundred thirty-eight".