18984419 has 4 divisors (see below), whose sum is σ = 19006944. Its totient is φ = 18961896.

The previous prime is 18984409. The next prime is 18984437. The reversal of 18984419 is 91448981.

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 18984419 - 2⁴ = 18984403 is a prime.

It is a super-2 number, since 2×18984419² = 720816329535122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18984419.

It is not an unprimeable number, because it can be changed into a prime (18984409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9947 + ... + 11700.

It is an arithmetic number, because the mean of its divisors is an integer number (4751736).

Almost surely, 2^18984419 is an apocalyptic number.

18984419 is a deficient number, since it is larger than the sum of its proper divisors (22525).

18984419 is an equidigital number, since it uses as much as digits as its factorization.

18984419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22524.

The product of its digits is 82944, while the sum is 44.

The square root of 18984419 is about 4357.1113137032. Note that the first 3 decimals coincide. The cubic root of 18984419 is about 266.7672039315.

The spelling of 18984419 in words is "eighteen million, nine hundred eighty-four thousand, four hundred nineteen".