18765380 has 24 divisors (see below), whose sum is σ = 39950232. Its totient is φ = 7402752.

The previous prime is 18765377. The next prime is 18765403. The reversal of 18765380 is 8356781.

It can be written as a sum of positive squares in 4 ways, for example, as 906304 + 17859076 = 952^2 + 4226^2 .

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

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 7 ways as a sum of consecutive naturals, for example, 4967 + ... + 7886.

It is an arithmetic number, because the mean of its divisors is an integer number (1664593).

Almost surely, 2^18765380 is an apocalyptic number.

18765380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18765380 is an abundant number, since it is smaller than the sum of its proper divisors (21184852).

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

18765380 is a wasteful number, since it uses less digits than its factorization.

18765380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12935 (or 12933 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 18765380 is about 4331.9025843156. The cubic root of 18765380 is about 265.7372610605.

The spelling of 18765380 in words is "eighteen million, seven hundred sixty-five thousand, three hundred eighty".