1220889 has 16 divisors (see below), whose sum is σ = 1772928. Its totient is φ = 744192.

The previous prime is 1220839. The next prime is 1220893. The reversal of 1220889 is 9880221.

It is not a de Polignac number, because 1220889 - 2⁷ = 1220761 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1220819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1564 + ... + 2210.

It is an arithmetic number, because the mean of its divisors is an integer number (110808).

2^1220889 is an apocalyptic number.

It is an amenable number.

1220889 is a deficient number, since it is larger than the sum of its proper divisors (552039).

1220889 is a wasteful number, since it uses less digits than its factorization.

1220889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 1220889 is about 1104.9384598248. The cubic root of 1220889 is about 106.8789208917.

The spelling of 1220889 in words is "one million, two hundred twenty thousand, eight hundred eighty-nine".