2180000 has 60 divisors (see below), whose sum is σ = 5412330. Its totient is φ = 864000.

The previous prime is 2179997. The next prime is 2180021. The reversal of 2180000 is 812.

It can be written as a sum of positive squares in 5 ways, for example, as 94864 + 2085136 = 308^2 + 1444^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 19946 + ... + 20054.

2^2180000 is an apocalyptic number.

2180000 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 2180000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2706165).

2180000 is an abundant number, since it is smaller than the sum of its proper divisors (3232330).

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

2180000 is an equidigital number, since it uses as much as digits as its factorization.

2180000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139 (or 116 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 2180000 is about 1476.4823060233. The cubic root of 2180000 is about 129.6638256974.

Adding to 2180000 its reverse (812), we get a palindrome (2180812).

It can be divided in two parts, 2 and 180000, that multiplied together give a square (360000 = 600²).

The spelling of 2180000 in words is "two million, one hundred eighty thousand".