2190000 has 100 divisors (see below), whose sum is σ = 7166456. Its totient is φ = 576000.

The previous prime is 2189989. The next prime is 2190017. The reversal of 2190000 is 912.

2190000 = T₉₅ + T₉₆ + ... + T₂₄₀.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (100).

It is a super-2 number, since 2×2190000² = 9592200000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 29964 + ... + 30036.

2^2190000 is an apocalyptic number.

2190000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2190000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3583228).

2190000 is an abundant number, since it is smaller than the sum of its proper divisors (4976456).

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

2190000 is an equidigital number, since it uses as much as digits as its factorization.

2190000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104 (or 83 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 2190000 is about 1479.8648586949. The cubic root of 2190000 is about 129.8617860440.

Adding to 2190000 its reverse (912), we get a palindrome (2190912).

The spelling of 2190000 in words is "two million, one hundred ninety thousand".