1821340 has 24 divisors (see below), whose sum is σ = 4026960. Its totient is φ = 690048.

The previous prime is 1821331. The next prime is 1821353. The reversal of 1821340 is 431281.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2017 + ... + 2776.

It is an arithmetic number, because the mean of its divisors is an integer number (167790).

2^1821340 is an apocalyptic number.

1821340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1821340 is an abundant number, since it is smaller than the sum of its proper divisors (2205620).

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

1821340 is a wasteful number, since it uses less digits than its factorization.

1821340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4821 (or 4819 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 1821340 is about 1349.5703019850. The cubic root of 1821340 is about 122.1228718191.

The spelling of 1821340 in words is "one million, eight hundred twenty-one thousand, three hundred forty".