18000780 has 48 divisors (see below), whose sum is σ = 57603840. Its totient is φ = 4114368.

The previous prime is 18000779. The next prime is 18000797. The reversal of 18000780 is 8700081.

It is a self number, because there is not a number n which added to its sum of digits gives 18000780.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21010 + ... + 21849.

It is an arithmetic number, because the mean of its divisors is an integer number (1200080).

Almost surely, 2^18000780 is an apocalyptic number.

18000780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18000780 is an abundant number, since it is smaller than the sum of its proper divisors (39603060).

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

18000780 is a wasteful number, since it uses less digits than its factorization.

18000780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42878 (or 42876 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 18000780 is about 4242.7326100050. The cubic root of 18000780 is about 262.0779248816.

The spelling of 18000780 in words is "eighteen million, seven hundred eighty", and thus it is an aban number.