1222689 has 16 divisors (see below), whose sum is σ = 1778112. Its totient is φ = 742848.

The previous prime is 1222681. The next prime is 1222693. The reversal of 1222689 is 9862221.

It is not a de Polignac number, because 1222689 - 2³ = 1222681 is a prime.

It is a Curzon number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1222681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4027 + ... + 4319.

It is an arithmetic number, because the mean of its divisors is an integer number (111132).

2^1222689 is an apocalyptic number.

It is an amenable number.

1222689 is a deficient number, since it is larger than the sum of its proper divisors (555423).

1222689 is a wasteful number, since it uses less digits than its factorization.

1222689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416.

The product of its digits is 3456, while the sum is 30.

The square root of 1222689 is about 1105.7526848260. The cubic root of 1222689 is about 106.9314202288.

The spelling of 1222689 in words is "one million, two hundred twenty-two thousand, six hundred eighty-nine".