1220609689 has 8 divisors (see below), whose sum is σ = 1322569472. Its totient is φ = 1119802320.

The previous prime is 1220609659. The next prime is 1220609699. The reversal of 1220609689 is 9869060221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1220609689 - 2⁵ = 1220609657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220609659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 285897 + ... + 290134.

It is an arithmetic number, because the mean of its divisors is an integer number (165321184).

Almost surely, 2^1220609689 is an apocalyptic number.

It is an amenable number.

1220609689 is a deficient number, since it is larger than the sum of its proper divisors (101959783).

1220609689 is a wasteful number, since it uses less digits than its factorization.

1220609689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576207.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 1220609689 is about 34937.2249756617. The cubic root of 1220609689 is about 1068.7076979985.

The spelling of 1220609689 in words is "one billion, two hundred twenty million, six hundred nine thousand, six hundred eighty-nine".