2221990 has 8 divisors (see below), whose sum is σ = 3999600. Its totient is φ = 888792.

The previous prime is 2221981. The next prime is 2221991. The reversal of 2221990 is 991222.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111090 + ... + 111109.

It is an arithmetic number, because the mean of its divisors is an integer number (499950).

2^2221990 is an apocalyptic number.

2221990 is a deficient number, since it is larger than the sum of its proper divisors (1777610).

2221990 is a wasteful number, since it uses less digits than its factorization.

2221990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222206.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 2221990 is about 1490.6340932637. The cubic root of 2221990 is about 130.4910422843.

The spelling of 2221990 in words is "two million, two hundred twenty-one thousand, nine hundred ninety".