1820215 has 8 divisors (see below), whose sum is σ = 2243520. Its totient is φ = 1416672.

The previous prime is 1820213. The next prime is 1820237. The reversal of 1820215 is 5120281.

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 1820215 - 2¹ = 1820213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1820192 and 1820201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820213) 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, 4735 + ... + 5104.

It is an arithmetic number, because the mean of its divisors is an integer number (280440).

2^1820215 is an apocalyptic number.

1820215 is a deficient number, since it is larger than the sum of its proper divisors (423305).

1820215 is an equidigital number, since it uses as much as digits as its factorization.

1820215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9881.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 1820215 is about 1349.1534382716. The cubic root of 1820215 is about 122.0977224734.

Adding to 1820215 its reverse (5120281), we get a palindrome (6940496).

The spelling of 1820215 in words is "one million, eight hundred twenty thousand, two hundred fifteen".