18919019 has 8 divisors (see below), whose sum is σ = 21661920. Its totient is φ = 16186176.

The previous prime is 18919013. The next prime is 18919027. The reversal of 18919019 is 91091981.

It is a happy number.

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 18919019 - 2¹² = 18914923 is a prime.

It is a super-2 number, since 2×18919019² = 715858559844722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18919013) 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, 2087 + ... + 6495.

It is an arithmetic number, because the mean of its divisors is an integer number (2707740).

Almost surely, 2^18919019 is an apocalyptic number.

18919019 is a deficient number, since it is larger than the sum of its proper divisors (2742901).

18919019 is an equidigital number, since it uses as much as digits as its factorization.

18919019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5029.

The product of its (nonzero) digits is 5832, while the sum is 38.

The square root of 18919019 is about 4349.5998666544. The cubic root of 18919019 is about 266.4605200197.

The spelling of 18919019 in words is "eighteen million, nine hundred nineteen thousand, nineteen".