1821960 has 128 divisors (see below), whose sum is σ = 6969600. Its totient is φ = 414720.

The previous prime is 1821959. The next prime is 1821997. The reversal of 1821960 is 691281.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7440 + ... + 7680.

It is an arithmetic number, because the mean of its divisors is an integer number (54450).

2^1821960 is an apocalyptic number.

1821960 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 1821960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3484800).

1821960 is an abundant number, since it is smaller than the sum of its proper divisors (5147640).

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

1821960 is a wasteful number, since it uses less digits than its factorization.

1821960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268 (or 258 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 1821960 is about 1349.7999851830. The cubic root of 1821960 is about 122.1367274768.

The spelling of 1821960 in words is "one million, eight hundred twenty-one thousand, nine hundred sixty".