18223780 has 24 divisors (see below), whose sum is σ = 39086208. Its totient is φ = 7134048.

The previous prime is 18223771. The next prime is 18223781. The reversal of 18223780 is 8732281.

It is not an unprimeable number, because it can be changed into a prime (18223781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8754 + ... + 10633.

It is an arithmetic number, because the mean of its divisors is an integer number (1628592).

Almost surely, 2^18223780 is an apocalyptic number.

18223780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18223780 is an abundant number, since it is smaller than the sum of its proper divisors (20862428).

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

18223780 is a wasteful number, since it uses less digits than its factorization.

18223780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19443 (or 19441 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 18223780 is about 4268.9319507343. The cubic root of 18223780 is about 263.1557242067.

The spelling of 18223780 in words is "eighteen million, two hundred twenty-three thousand, seven hundred eighty".