18927990919 has 8 divisors (see below), whose sum is σ = 19177953200. Its totient is φ = 18679147776.

The previous prime is 18927990911. The next prime is 18927990929. The reversal of 18927990919 is 91909972981.

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 18927990919 - 2³ = 18927990911 is a prime.

It is a super-2 number, since 2×18927990919² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18927990911) 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, 245709 + ... + 313414.

It is an arithmetic number, because the mean of its divisors is an integer number (2397244150).

Almost surely, 2^18927990919 is an apocalyptic number.

18927990919 is a deficient number, since it is larger than the sum of its proper divisors (249962281).

18927990919 is an equidigital number, since it uses as much as digits as its factorization.

18927990919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559569.

The product of its (nonzero) digits is 6613488, while the sum is 64.

The spelling of 18927990919 in words is "eighteen billion, nine hundred twenty-seven million, nine hundred ninety thousand, nine hundred nineteen".