840022213 has 4 divisors (see below), whose sum is σ = 846153900. Its totient is φ = 833890528.

The previous prime is 840022199. The next prime is 840022237. The reversal of 840022213 is 312220048.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 270865764 + 569156449 = 16458^2 + 23857^2 .

It is a cyclic number.

It is not a de Polignac number, because 840022213 - 2⁵ = 840022181 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 (840022013) 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, 3065638 + ... + 3065911.

It is an arithmetic number, because the mean of its divisors is an integer number (211538475).

Almost surely, 2^840022213 is an apocalyptic number.

It is an amenable number.

840022213 is a deficient number, since it is larger than the sum of its proper divisors (6131687).

840022213 is a wasteful number, since it uses less digits than its factorization.

840022213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6131686.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 840022213 is about 28983.1367005022. The cubic root of 840022213 is about 943.5471129849.

The spelling of 840022213 in words is "eight hundred forty million, twenty-two thousand, two hundred thirteen".