1220009989 has 4 divisors (see below), whose sum is σ = 1330920000. Its totient is φ = 1109099980.

The previous prime is 1220009977. The next prime is 1220009993. The reversal of 1220009989 is 9899000221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1220009989 - 2¹⁵ = 1219977221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220009939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55454989 + ... + 55455010.

It is an arithmetic number, because the mean of its divisors is an integer number (332730000).

Almost surely, 2^1220009989 is an apocalyptic number.

It is an amenable number.

1220009989 is a deficient number, since it is larger than the sum of its proper divisors (110910011).

1220009989 is a wasteful number, since it uses less digits than its factorization.

1220009989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110910010.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 1220009989 is about 34928.6413849723. The cubic root of 1220009989 is about 1068.5326464096.

The spelling of 1220009989 in words is "one billion, two hundred twenty million, nine thousand, nine hundred eighty-nine".