1820011 has 8 divisors (see below), whose sum is σ = 1905120. Its totient is φ = 1736448.

The previous prime is 1820009. The next prime is 1820023. The reversal of 1820011 is 1100281.

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

It is a cyclic number.

It is not a de Polignac number, because 1820011 - 2¹ = 1820009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1819973 and 1820000.

It is not an unprimeable number, because it can be changed into a prime (1820051) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2490 + ... + 3136.

It is an arithmetic number, because the mean of its divisors is an integer number (238140).

2^1820011 is an apocalyptic number.

1820011 is a deficient number, since it is larger than the sum of its proper divisors (85109).

1820011 is an equidigital number, since it uses as much as digits as its factorization.

1820011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1820011 is about 1349.0778331883. The cubic root of 1820011 is about 122.0931609489.

Adding to 1820011 its reverse (1100281), we get a palindrome (2920292).

The spelling of 1820011 in words is "one million, eight hundred twenty thousand, eleven".