1820090 has 8 divisors (see below), whose sum is σ = 3276180. Its totient is φ = 728032.

The previous prime is 1820089. The next prime is 1820111. The reversal of 1820090 is 900281.

It can be written as a sum of positive squares in 2 ways, for example, as 1819801 + 289 = 1349^2 + 17^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90995 + ... + 91014.

2^1820090 is an apocalyptic number.

1820090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1820090 is a deficient number, since it is larger than the sum of its proper divisors (1456090).

1820090 is a wasteful number, since it uses less digits than its factorization.

1820090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182016.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 1820090 is about 1349.1071121301. The cubic root of 1820090 is about 122.0949274621.

The spelling of 1820090 in words is "one million, eight hundred twenty thousand, ninety".