18365181940 has 48 divisors (see below), whose sum is σ = 46669174272. Its totient is φ = 5926242816.

The previous prime is 18365181881. The next prime is 18365181941. The reversal of 18365181940 is 4918156381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18365181941) 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 15 ways as a sum of consecutive naturals, for example, 3855852 + ... + 3860611.

It is an arithmetic number, because the mean of its divisors is an integer number (972274464).

Almost surely, 2^18365181940 is an apocalyptic number.

18365181940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18365181940 is an abundant number, since it is smaller than the sum of its proper divisors (28303992332).

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

18365181940 is a wasteful number, since it uses less digits than its factorization.

18365181940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7716496 (or 7716494 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 46.

The spelling of 18365181940 in words is "eighteen billion, three hundred sixty-five million, one hundred eighty-one thousand, nine hundred forty".