1800542556 has 36 divisors (see below), whose sum is σ = 4819100832. Its totient is φ = 564875904.

The previous prime is 1800542521. The next prime is 1800542561. The reversal of 1800542556 is 6552450081.

1800542556 is a `hidden beast` number, since 180 + 0 + 5 + 425 + 56 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1800542556.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1470420 + ... + 1471643.

It is an arithmetic number, because the mean of its divisors is an integer number (133863912).

Almost surely, 2^1800542556 is an apocalyptic number.

It is an amenable number.

1800542556 is an abundant number, since it is smaller than the sum of its proper divisors (3018558276).

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

1800542556 is a wasteful number, since it uses less digits than its factorization.

1800542556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2942090 (or 2942085 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 36.

The square root of 1800542556 is about 42432.8004732188. The cubic root of 1800542556 is about 1216.5626066586.

The spelling of 1800542556 in words is "one billion, eight hundred million, five hundred forty-two thousand, five hundred fifty-six".