1820255 has 8 divisors (see below), whose sum is σ = 2214672. Its totient is φ = 1435968.

The previous prime is 1820249. The next prime is 1820261. The reversal of 1820255 is 5520281.

It is an interprime number because it is at equal distance from previous prime (1820249) and next prime (1820261).

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 1820255 - 2⁸ = 1819999 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1820255.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2129 + ... + 2858.

It is an arithmetic number, because the mean of its divisors is an integer number (276834).

2^1820255 is an apocalyptic number.

1820255 is a deficient number, since it is larger than the sum of its proper divisors (394417).

1820255 is an equidigital number, since it uses as much as digits as its factorization.

1820255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5065.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 1820255 is about 1349.1682623009. The cubic root of 1820255 is about 122.0986168500.

The spelling of 1820255 in words is "one million, eight hundred twenty thousand, two hundred fifty-five".