1806540 has 24 divisors (see below), whose sum is σ = 5058480. Its totient is φ = 481728.

The previous prime is 1806533. The next prime is 1806551. The reversal of 1806540 is 456081.

It is a self number, because there is not a number n which added to its sum of digits gives 1806540.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14995 + ... + 15114.

It is an arithmetic number, because the mean of its divisors is an integer number (210770).

2^1806540 is an apocalyptic number.

1806540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1806540 is an abundant number, since it is smaller than the sum of its proper divisors (3251940).

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

1806540 is a wasteful number, since it uses less digits than its factorization.

1806540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30121 (or 30119 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 1806540 is about 1344.0758907145. The cubic root of 1806540 is about 121.7911862928.

It can be divided in two parts, 1806 and 540, that added together give a triangular number (2346 = T₆₈).

The spelling of 1806540 in words is "one million, eight hundred six thousand, five hundred forty".