18381383738 has 16 divisors (see below), whose sum is σ = 27679332960. Its totient is φ = 9154963056.

The previous prime is 18381383717. The next prime is 18381383767. The reversal of 18381383738 is 83738318381.

It is a super-2 number, since 2×18381383738² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18381383738.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2757053 + ... + 2763711.

It is an arithmetic number, because the mean of its divisors is an integer number (1729958310).

Almost surely, 2^18381383738 is an apocalyptic number.

18381383738 is a deficient number, since it is larger than the sum of its proper divisors (9297949222).

18381383738 is a wasteful number, since it uses less digits than its factorization.

18381383738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11821.

The product of its digits is 2322432, while the sum is 53.

The spelling of 18381383738 in words is "eighteen billion, three hundred eighty-one million, three hundred eighty-three thousand, seven hundred thirty-eight".