1216422 has 12 divisors (see below), whose sum is σ = 2635620. Its totient is φ = 405468.

The previous prime is 1216421. The next prime is 1216433. The reversal of 1216422 is 2246121.

1216422 is a `hidden beast` number, since 1 + 21 + 642 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 67579 = 1216422 / (1 + 2 + 1 + 6 + 4 + 2 + 2).

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 1216395 and 1216404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216421) 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, 33772 + ... + 33807.

It is an arithmetic number, because the mean of its divisors is an integer number (219635).

2^1216422 is an apocalyptic number.

1216422 is an abundant number, since it is smaller than the sum of its proper divisors (1419198).

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

1216422 is a wasteful number, since it uses less digits than its factorization.

1216422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67587 (or 67584 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 1216422 is about 1102.9152279301. The cubic root of 1216422 is about 106.7484117302.

The spelling of 1216422 in words is "one million, two hundred sixteen thousand, four hundred twenty-two".