1089021 has 8 divisors (see below), whose sum is σ = 1491424. Its totient is φ = 706320.

The previous prime is 1089017. The next prime is 1089029. The reversal of 1089021 is 1209801.

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

It is not a de Polignac number, because 1089021 - 2² = 1089017 is a prime.

It is a Duffinian number.

1089021 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1089029) 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 7 ways as a sum of consecutive naturals, for example, 4795 + ... + 5016.

It is an arithmetic number, because the mean of its divisors is an integer number (186428).

2^1089021 is an apocalyptic number.

It is an amenable number.

1089021 is a deficient number, since it is larger than the sum of its proper divisors (402403).

1089021 is an equidigital number, since it uses as much as digits as its factorization.

1089021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9851.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 1089021 is about 1043.5616895996. The cubic root of 1089021 is about 102.8834260985.

The spelling of 1089021 in words is "one million, eighty-nine thousand, twenty-one".