1820236 has 24 divisors (see below), whose sum is σ = 3563280. Its totient is φ = 806400.

The previous prime is 1820213. The next prime is 1820237. The reversal of 1820236 is 6320281.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (1820237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1300 + ... + 2308.

It is an arithmetic number, because the mean of its divisors is an integer number (148470).

2^1820236 is an apocalyptic number.

It is an amenable number.

1820236 is a deficient number, since it is larger than the sum of its proper divisors (1743044).

1820236 is a wasteful number, since it uses less digits than its factorization.

1820236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065 (or 1063 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 1820236 is about 1349.1612209073. The cubic root of 1820236 is about 122.0981920228.

The spelling of 1820236 in words is "one million, eight hundred twenty thousand, two hundred thirty-six".