1808240 has 40 divisors (see below), whose sum is σ = 4806240. Its totient is φ = 619776.

The previous prime is 1808207. The next prime is 1808243. The reversal of 1808240 is 428081.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1808243) 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, 1055 + ... + 2174.

It is an arithmetic number, because the mean of its divisors is an integer number (120156).

2^1808240 is an apocalyptic number.

1808240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1808240 is an abundant number, since it is smaller than the sum of its proper divisors (2998000).

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

1808240 is a wasteful number, since it uses less digits than its factorization.

1808240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3249 (or 3243 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 1808240 is about 1344.7081467739. The cubic root of 1808240 is about 121.8293771818.

It can be divided in two parts, 1808 and 240, that added together give a 11-th power (2048 = 2¹¹).

The spelling of 1808240 in words is "one million, eight hundred eight thousand, two hundred forty".