1820850 has 48 divisors (see below), whose sum is σ = 4612800. Its totient is φ = 475200.

The previous prime is 1820843. The next prime is 1820857. The reversal of 1820850 is 580281.

It is an interprime number because it is at equal distance from previous prime (1820843) and next prime (1820857).

It is a self number, because there is not a number n which added to its sum of digits gives 1820850.

It is not an unprimeable number, because it can be changed into a prime (1820857) 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 23 ways as a sum of consecutive naturals, for example, 9051 + ... + 9249.

It is an arithmetic number, because the mean of its divisors is an integer number (96100).

2^1820850 is an apocalyptic number.

1820850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1820850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2306400).

1820850 is an abundant number, since it is smaller than the sum of its proper divisors (2791950).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1820850 is a wasteful number, since it uses less digits than its factorization.

1820850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275 (or 270 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 24.

The square root of 1820850 is about 1349.3887505089. The cubic root of 1820850 is about 122.1119191552. Note that the first 3 decimals are identical.

The spelling of 1820850 in words is "one million, eight hundred twenty thousand, eight hundred fifty".