18983819 has 4 divisors (see below), whose sum is σ = 19057944. Its totient is φ = 18909696.

The previous prime is 18983807. The next prime is 18983837. The reversal of 18983819 is 91838981.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18983819 - 2²⁰ = 17935243 is a prime.

It is a super-2 number, since 2×18983819² = 720770767649522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18983219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36677 + ... + 37190.

It is an arithmetic number, because the mean of its divisors is an integer number (4764486).

Almost surely, 2^18983819 is an apocalyptic number.

18983819 is a deficient number, since it is larger than the sum of its proper divisors (74125).

18983819 is an equidigital number, since it uses as much as digits as its factorization.

18983819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74124.

The product of its digits is 124416, while the sum is 47.

The square root of 18983819 is about 4357.0424602016. The cubic root of 18983819 is about 266.7643935214.

The spelling of 18983819 in words is "eighteen million, nine hundred eighty-three thousand, eight hundred nineteen".