1808080 has 40 divisors (see below), whose sum is σ = 4265352. Its totient is φ = 712704.

The previous prime is 1808077. The next prime is 1808083. The reversal of 1808080 is 808081.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1808077) and next prime (1808083).

It can be written as a sum of positive squares in 4 ways, for example, as 33856 + 1774224 = 184^2 + 1332^2 .

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 (1808083) 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 7 ways as a sum of consecutive naturals, for example, 7644 + ... + 7876.

2^1808080 is an apocalyptic number.

1808080 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 1808080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2132676).

1808080 is an abundant number, since it is smaller than the sum of its proper divisors (2457272).

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

1808080 is a wasteful number, since it uses less digits than its factorization.

1808080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343 (or 337 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 25.

The square root of 1808080 is about 1344.6486529945. The cubic root of 1808080 is about 121.8257837659.

Subtracting from 1808080 its reverse (808081), we obtain a palindrome (999999).

The spelling of 1808080 in words is "one million, eight hundred eight thousand, eighty".