2221830 has 80 divisors (see below), whose sum is σ = 6464304. Its totient is φ = 544320.

The previous prime is 2221829. The next prime is 2221837. The reversal of 2221830 is 381222.

It is a happy number.

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221837) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 10425 + ... + 10635.

2^2221830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2221830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3232152).

2221830 is an abundant number, since it is smaller than the sum of its proper divisors (4242474).

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

2221830 is a wasteful number, since it uses less digits than its factorization.

2221830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243 (or 234 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 2221830 is about 1490.5804238618. The cubic root of 2221830 is about 130.4879100968.

The spelling of 2221830 in words is "two million, two hundred twenty-one thousand, eight hundred thirty".