18140987909 has 8 divisors (see below), whose sum is σ = 19794406752. Its totient is φ = 16488275440.

The previous prime is 18140987863. The next prime is 18140987939. The reversal of 18140987909 is 90978904181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18140987909 - 2²⁴ = 18124210693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18140987939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122159 + ... + 226284.

It is an arithmetic number, because the mean of its divisors is an integer number (2474300844).

Almost surely, 2^18140987909 is an apocalyptic number.

It is an amenable number.

18140987909 is a deficient number, since it is larger than the sum of its proper divisors (1653418843).

18140987909 is a wasteful number, since it uses less digits than its factorization.

18140987909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353187.

The product of its (nonzero) digits is 1306368, while the sum is 56.

The spelling of 18140987909 in words is "eighteen billion, one hundred forty million, nine hundred eighty-seven thousand, nine hundred nine".