1222918 has 4 divisors (see below), whose sum is σ = 1834380. Its totient is φ = 611458.

The previous prime is 1222913. The next prime is 1222931. The reversal of 1222918 is 8192221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8192221 = 79 ⋅103699.

It is a junction number, because it is equal to n+sod(n) for n = 1222892 and 1222901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305728 + ... + 305731.

It is an arithmetic number, because the mean of its divisors is an integer number (458595).

2^1222918 is an apocalyptic number.

1222918 is a deficient number, since it is larger than the sum of its proper divisors (611462).

1222918 is an equidigital number, since it uses as much as digits as its factorization.

1222918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611461.

The product of its digits is 576, while the sum is 25.

The square root of 1222918 is about 1105.8562293535. The cubic root of 1222918 is about 106.9380956158.

The spelling of 1222918 in words is "one million, two hundred twenty-two thousand, nine hundred eighteen".