1820340 has 48 divisors (see below), whose sum is σ = 5664960. Its totient is φ = 485280.

The previous prime is 1820339. The next prime is 1820341. The reversal of 1820340 is 430281.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1820339) and next prime (1820341).

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 (1820341) 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, 1146 + ... + 2225.

It is an arithmetic number, because the mean of its divisors is an integer number (118020).

2^1820340 is an apocalyptic number.

1820340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1820340 is an abundant number, since it is smaller than the sum of its proper divisors (3844620).

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

1820340 is a wasteful number, since it uses less digits than its factorization.

1820340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3389 (or 3381 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1820340 is about 1349.1997628224. The cubic root of 1820340 is about 122.1005173568.

The spelling of 1820340 in words is "one million, eight hundred twenty thousand, three hundred forty".