1808040 has 128 divisors (see below), whose sum is σ = 6249600. Its totient is φ = 414720.

The previous prime is 1808039. The next prime is 1808041. The reversal of 1808040 is 408081.

It is an interprime number because it is at equal distance from previous prime (1808039) and next prime (1808041).

It is a junction number, because it is equal to n+sod(n) for n = 1807998 and 1808016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1808041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29610 + ... + 29670.

It is an arithmetic number, because the mean of its divisors is an integer number (48825).

2^1808040 is an apocalyptic number.

1808040 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 1808040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3124800).

1808040 is an abundant number, since it is smaller than the sum of its proper divisors (4441560).

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

1808040 is a wasteful number, since it uses less digits than its factorization.

1808040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107 (or 103 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 1808040 is about 1344.6337791384. The cubic root of 1808040 is about 121.8248853788.

The spelling of 1808040 in words is "one million, eight hundred eight thousand, forty".