1806690544 has 20 divisors (see below), whose sum is σ = 3684698440. Its totient is φ = 855800640.

The previous prime is 1806690541. The next prime is 1806690551. The reversal of 1806690544 is 4450966081.

It is a self number, because there is not a number n which added to its sum of digits gives 1806690544.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1806690541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2971227 + ... + 2971834.

It is an arithmetic number, because the mean of its divisors is an integer number (184234922).

Almost surely, 2^1806690544 is an apocalyptic number.

It is an amenable number.

1806690544 is an abundant number, since it is smaller than the sum of its proper divisors (1878007896).

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

1806690544 is a wasteful number, since it uses less digits than its factorization.

1806690544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5943088 (or 5943082 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 1806690544 is about 42505.1825546015. The cubic root of 1806690544 is about 1217.9456926488.

The spelling of 1806690544 in words is "one billion, eight hundred six million, six hundred ninety thousand, five hundred forty-four".