1805780 has 12 divisors (see below), whose sum is σ = 3792180. Its totient is φ = 722304.

The previous prime is 1805773. The next prime is 1805789. The reversal of 1805780 is 875081.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1359556 + 446224 = 1166^2 + 668^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1805789) 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, 45125 + ... + 45164.

It is an arithmetic number, because the mean of its divisors is an integer number (316015).

2^1805780 is an apocalyptic number.

1805780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1805780 is an abundant number, since it is smaller than the sum of its proper divisors (1986400).

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

1805780 is a wasteful number, since it uses less digits than its factorization.

1805780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90298 (or 90296 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 29.

The square root of 1805780 is about 1343.7931388424. The cubic root of 1805780 is about 121.7741049689.

It can be divided in two parts, 180 and 5780, that multiplied together give a square (1040400 = 1020²).

The spelling of 1805780 in words is "one million, eight hundred five thousand, seven hundred eighty".