18340781739 has 32 divisors (see below), whose sum is σ = 29421149184. Its totient is φ = 9936030720.

The previous prime is 18340781731. The next prime is 18340781741. The reversal of 18340781739 is 93718704381.

It is not a de Polignac number, because 18340781739 - 2³ = 18340781731 is a prime.

It is a super-3 number, since 3×18340781739³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18340781691 and 18340781700.

It is not an unprimeable number, because it can be changed into a prime (18340781731) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 113442 + ... + 222599.

It is an arithmetic number, because the mean of its divisors is an integer number (919410912).

Almost surely, 2^18340781739 is an apocalyptic number.

18340781739 is a deficient number, since it is larger than the sum of its proper divisors (11080367445).

18340781739 is a wasteful number, since it uses less digits than its factorization.

18340781739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336187.

The product of its (nonzero) digits is 1016064, while the sum is 51.

The spelling of 18340781739 in words is "eighteen billion, three hundred forty million, seven hundred eighty-one thousand, seven hundred thirty-nine".