1821180 has 48 divisors (see below), whose sum is σ = 5160960. Its totient is φ = 479808.

The previous prime is 1821167. The next prime is 1821181. The reversal of 1821180 is 811281.

1821180 = 51² + 52² + ... + 177².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1821181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7501 + ... + 7739.

It is an arithmetic number, because the mean of its divisors is an integer number (107520).

2^1821180 is an apocalyptic number.

1821180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1821180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2580480).

1821180 is an abundant number, since it is smaller than the sum of its proper divisors (3339780).

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

1821180 is a wasteful number, since it uses less digits than its factorization.

1821180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378 (or 376 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 21.

The square root of 1821180 is about 1349.5110225559. The cubic root of 1821180 is about 122.1192956551.

The spelling of 1821180 in words is "one million, eight hundred twenty-one thousand, one hundred eighty".