1805980 has 24 divisors (see below), whose sum is σ = 4137840. Its totient is φ = 656640.

The previous prime is 1805963. The next prime is 1805989. The reversal of 1805980 is 895081.

1805980 = T₁₁₀ + T₁₁₁ + ... + T₂₂₉.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1805989) 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, 3885 + ... + 4324.

It is an arithmetic number, because the mean of its divisors is an integer number (172410).

2^1805980 is an apocalyptic number.

1805980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1805980 is an abundant number, since it is smaller than the sum of its proper divisors (2331860).

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

1805980 is a wasteful number, since it uses less digits than its factorization.

1805980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8229 (or 8227 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 31.

The square root of 1805980 is about 1343.8675529977. The cubic root of 1805980 is about 121.7786005187.

It can be divided in two parts, 1805 and 980, that multiplied together give a square (1768900 = 1330²).

The spelling of 1805980 in words is "one million, eight hundred five thousand, nine hundred eighty".