1820550 has 48 divisors (see below), whose sum is σ = 4620240. Its totient is φ = 474240.

The previous prime is 1820549. The next prime is 1820551. The reversal of 1820550 is 550281.

It is an interprime number because it is at equal distance from previous prime (1820549) and next prime (1820551).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7836 + ... + 8064.

It is an arithmetic number, because the mean of its divisors is an integer number (96255).

2^1820550 is an apocalyptic number.

1820550 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 1820550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2310120).

1820550 is an abundant number, since it is smaller than the sum of its proper divisors (2799690).

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

1820550 is a wasteful number, since it uses less digits than its factorization.

1820550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297 (or 292 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 1820550 is about 1349.2775844873. The cubic root of 1820550 is about 122.1052124729.

The spelling of 1820550 in words is "one million, eight hundred twenty thousand, five hundred fifty".