1821150 has 96 divisors (see below), whose sum is σ = 5356800. Its totient is φ = 453600.

The previous prime is 1821139. The next prime is 1821151. The reversal of 1821150 is 511281.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1821151) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 25615 + ... + 25685.

It is an arithmetic number, because the mean of its divisors is an integer number (55800).

2^1821150 is an apocalyptic number.

1821150 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a pronic number, being equal to 1349×1350.

It is a practical number, because each smaller number is the sum of distinct divisors of 1821150, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2678400).

1821150 is an abundant number, since it is smaller than the sum of its proper divisors (3535650).

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

1821150 is a wasteful number, since it uses less digits than its factorization.

1821150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111 (or 100 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 1821150 is about 1349.4999073731. The cubic root of 1821150 is about 122.1186251010.

The spelling of 1821150 in words is "one million, eight hundred twenty-one thousand, one hundred fifty".