18840591819 has 40 divisors (see below), whose sum is σ = 34057333728. Its totient is φ = 10132750080.

The previous prime is 18840591817. The next prime is 18840591863. The reversal of 18840591819 is 91819504881.

18840591819 is a `hidden beast` number, since 1 + 8 + 8 + 40 + 591 + 8 + 1 + 9 = 666.

It is not a de Polignac number, because 18840591819 - 2¹ = 18840591817 is a prime.

It is a super-3 number, since 3×18840591819³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (18840591817) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 967672 + ... + 986949.

Almost surely, 2^18840591819 is an apocalyptic number.

18840591819 is a deficient number, since it is larger than the sum of its proper divisors (15216741909).

18840591819 is a wasteful number, since it uses less digits than its factorization.

18840591819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1954657 (or 1954648 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 54.

The spelling of 18840591819 in words is "eighteen billion, eight hundred forty million, five hundred ninety-one thousand, eight hundred nineteen".