840220989 has 8 divisors (see below), whose sum is σ = 1146348192. Its totient is φ = 547120560.

The previous prime is 840220967. The next prime is 840220999. The reversal of 840220989 is 989022048.

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

It is not a de Polignac number, because 840220989 - 2¹⁷ = 840089917 is a prime.

It is a super-2 number, since 2×840220989² = 1411942620712276242, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 840220989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840220949) 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, 3256542 + ... + 3256799.

It is an arithmetic number, because the mean of its divisors is an integer number (143293524).

Almost surely, 2^840220989 is an apocalyptic number.

It is an amenable number.

840220989 is a deficient number, since it is larger than the sum of its proper divisors (306127203).

840220989 is a wasteful number, since it uses less digits than its factorization.

840220989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6513387.

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 840220989 is about 28986.5656641141. The cubic root of 840220989 is about 943.6215315444.

The spelling of 840220989 in words is "eight hundred forty million, two hundred twenty thousand, nine hundred eighty-nine".