2209890 has 32 divisors (see below), whose sum is σ = 5584320. Its totient is φ = 558144.

The previous prime is 2209853. The next prime is 2209891. The reversal of 2209890 is 989022.

It is a super-2 number, since 2×2209890² = 9767227624200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2209891) 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, 1369 + ... + 2508.

It is an arithmetic number, because the mean of its divisors is an integer number (174510).

2^2209890 is an apocalyptic number.

2209890 is an abundant number, since it is smaller than the sum of its proper divisors (3374430).

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

2209890 is a wasteful number, since it uses less digits than its factorization.

2209890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3906.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 2209890 is about 1486.5698772678. The cubic root of 2209890 is about 130.2537450278.

The spelling of 2209890 in words is "two million, two hundred nine thousand, eight hundred ninety".