2221989 has 16 divisors (see below), whose sum is σ = 3694080. Its totient is φ = 1154160.

The previous prime is 2221981. The next prime is 2221991. The reversal of 2221989 is 9891222.

It is a happy number.

It is not a de Polignac number, because 2221989 - 2³ = 2221981 is a prime.

It is a super-2 number, since 2×2221989² = 9874470232242, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221981) 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, 4579 + ... + 5040.

It is an arithmetic number, because the mean of its divisors is an integer number (230880).

2^2221989 is an apocalyptic number.

It is an amenable number.

2221989 is a deficient number, since it is larger than the sum of its proper divisors (1472091).

2221989 is a wasteful number, since it uses less digits than its factorization.

2221989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9640.

The product of its digits is 5184, while the sum is 33.

The square root of 2221989 is about 1490.6337578359. The cubic root of 2221989 is about 130.4910227086.

It can be divided in two parts, 222 and 1989, that added together give a triangular number (2211 = T₆₆).

The spelling of 2221989 in words is "two million, two hundred twenty-one thousand, nine hundred eighty-nine".