1820250 has 48 divisors (see below), whose sum is σ = 4928040. Its totient is φ = 484800.

The previous prime is 1820249. The next prime is 1820261. The reversal of 1820250 is 520281.

It can be written as a sum of positive squares in 4 ways, for example, as 915849 + 904401 = 957^2 + 951^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1846 + ... + 2654.

2^1820250 is an apocalyptic number.

1820250 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 1820250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2464020).

1820250 is an abundant number, since it is smaller than the sum of its proper divisors (3107790).

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

1820250 is a wasteful number, since it uses less digits than its factorization.

1820250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832 (or 819 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 1820250 is about 1349.1664093061. The cubic root of 1820250 is about 122.0985050537.

The spelling of 1820250 in words is "one million, eight hundred twenty thousand, two hundred fifty".