1800080 has 20 divisors (see below), whose sum is σ = 4185372. Its totient is φ = 720000.

The previous prime is 1800067. The next prime is 1800083. The reversal of 1800080 is 800081.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1430416 + 369664 = 1196^2 + 608^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (17) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1800083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11171 + ... + 11330.

2^1800080 is an apocalyptic number.

1800080 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1800080 is an abundant number, since it is smaller than the sum of its proper divisors (2385292).

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

1800080 is a wasteful number, since it uses less digits than its factorization.

1800080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22514 (or 22508 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 1800080 is about 1341.6706004083. The cubic root of 1800080 is about 121.6458420187.

Subtracting from 1800080 its reverse (800081), we obtain a palindrome (999999).

It can be divided in two parts, 18000 and 80, that multiplied together give a square (1440000 = 1200²).

The spelling of 1800080 in words is "one million, eight hundred thousand, eighty".