1000221789 has 16 divisors (see below), whose sum is σ = 1573314560. Its totient is φ = 553117680.

The previous prime is 1000221787. The next prime is 1000221797. The reversal of 1000221789 is 9871220001.

It is not a de Polignac number, because 1000221789 - 2¹ = 1000221787 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 (1000221787) 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, 767569 + ... + 768870.

It is an arithmetic number, because the mean of its divisors is an integer number (98332160).

Almost surely, 2^1000221789 is an apocalyptic number.

It is an amenable number.

1000221789 is a deficient number, since it is larger than the sum of its proper divisors (573092771).

1000221789 is a wasteful number, since it uses less digits than its factorization.

1000221789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1536480.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 1000221789 is about 31626.2831992632. The cubic root of 1000221789 is about 1000.0739242017.

The spelling of 1000221789 in words is "one billion, two hundred twenty-one thousand, seven hundred eighty-nine".