18493004387 has 24 divisors (see below), whose sum is σ = 22842449952. Its totient is φ = 14843854080.

The previous prime is 18493004381. The next prime is 18493004393. The reversal of 18493004387 is 78340039481.

It is an interprime number because it is at equal distance from previous prime (18493004381) and next prime (18493004393).

It is not a de Polignac number, because 18493004387 - 2¹⁰ = 18493003363 is a prime.

It is a super-3 number, since 3×18493004387³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18493004381) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 219398 + ... + 291755.

It is an arithmetic number, because the mean of its divisors is an integer number (951768748).

Almost surely, 2^18493004387 is an apocalyptic number.

18493004387 is a deficient number, since it is larger than the sum of its proper divisors (4349445565).

18493004387 is a wasteful number, since it uses less digits than its factorization.

18493004387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511211 (or 511200 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 47.

The spelling of 18493004387 in words is "eighteen billion, four hundred ninety-three million, four thousand, three hundred eighty-seven".