2157822 has 24 divisors (see below), whose sum is σ = 4702464. Its totient is φ = 715104.

The previous prime is 2157821. The next prime is 2157823. The reversal of 2157822 is 2287512.

It is an interprime number because it is at equal distance from previous prime (2157821) and next prime (2157823).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157821) 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 11 ways as a sum of consecutive naturals, for example, 5443 + ... + 5825.

It is an arithmetic number, because the mean of its divisors is an integer number (195936).

2^2157822 is an apocalyptic number.

2157822 is an abundant number, since it is smaller than the sum of its proper divisors (2544642).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2157822 is a wasteful number, since it uses less digits than its factorization.

2157822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704 (or 701 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 2157822 is about 1468.9526881421. The cubic root of 2157822 is about 129.2226190242. Note that the first 3 decimals are identical.

The spelling of 2157822 in words is "two million, one hundred fifty-seven thousand, eight hundred twenty-two".