2221758 has 72 divisors (see below), whose sum is σ = 6135480. Its totient is φ = 574560.

The previous prime is 2221757. The next prime is 2221771. The reversal of 2221758 is 8571222.

It is a super-2 number, since 2×2221758² = 9872417221128, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221753) 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 35 ways as a sum of consecutive naturals, for example, 9588 + ... + 9816.

It is an arithmetic number, because the mean of its divisors is an integer number (85215).

2^2221758 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2221758, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3067740).

2221758 is an abundant number, since it is smaller than the sum of its proper divisors (3913722).

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

2221758 is a wasteful number, since it uses less digits than its factorization.

2221758 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262 (or 252 counting only the distinct ones).

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

The square root of 2221758 is about 1490.5562720005. The cubic root of 2221758 is about 130.4865005634.

The spelling of 2221758 in words is "two million, two hundred twenty-one thousand, seven hundred fifty-eight".