2221730 has 32 divisors (see below), whose sum is σ = 4841856. Its totient is φ = 716544.

The previous prime is 2221721. The next prime is 2221733. The reversal of 2221730 is 371222.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a junction number, because it is equal to n+sod(n) for n = 2221699 and 2221708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221733) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 257 + ... + 2123.

It is an arithmetic number, because the mean of its divisors is an integer number (151308).

2^2221730 is an apocalyptic number.

2221730 is an abundant number, since it is smaller than the sum of its proper divisors (2620126).

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

2221730 is a wasteful number, since it uses less digits than its factorization.

2221730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1898.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 2221730 is about 1490.5468795043. The cubic root of 2221730 is about 130.4859524032.

Adding to 2221730 its reverse (371222), we get a palindrome (2592952).

The spelling of 2221730 in words is "two million, two hundred twenty-one thousand, seven hundred thirty".