1805940 has 72 divisors (see below), whose sum is σ = 5591040. Its totient is φ = 471744.

The previous prime is 1805911. The next prime is 1805941. The reversal of 1805940 is 495081.

It is a super-2 number, since 2×1805940² = 6522838567200, which contains 22 as substring.

1805940 is a modest number, since divided by 5940 gives 180 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1805941) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14157 + ... + 14283.

2^1805940 is an apocalyptic number.

1805940 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 1805940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2795520).

1805940 is an abundant number, since it is smaller than the sum of its proper divisors (3785100).

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

1805940 is a wasteful number, since it uses less digits than its factorization.

1805940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221 (or 216 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 1805940 is about 1343.8526704963. The cubic root of 1805940 is about 121.7777014353. Note that the first 4 decimals are identical.

The spelling of 1805940 in words is "one million, eight hundred five thousand, nine hundred forty".