1820740 has 24 divisors (see below), whose sum is σ = 3890880. Its totient is φ = 715488.

The previous prime is 1820737. The next prime is 1820743. The reversal of 1820740 is 470281.

It is an interprime number because it is at equal distance from previous prime (1820737) and next prime (1820743).

It is not an unprimeable number, because it can be changed into a prime (1820743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 409 + ... + 1951.

It is an arithmetic number, because the mean of its divisors is an integer number (162120).

2^1820740 is an apocalyptic number.

1820740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1820740 is an abundant number, since it is smaller than the sum of its proper divisors (2070140).

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

1820740 is a wasteful number, since it uses less digits than its factorization.

1820740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1611 (or 1609 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 1820740 is about 1349.3479906977. The cubic root of 1820740 is about 122.1094601239.

The spelling of 1820740 in words is "one million, eight hundred twenty thousand, seven hundred forty".