18971419 has 4 divisors (see below), whose sum is σ = 18982360. Its totient is φ = 18960480.

The previous prime is 18971383. The next prime is 18971437. The reversal of 18971419 is 91417981.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 91417981 = 1823 ⋅50147.

It is a cyclic number.

It is not a de Polignac number, because 18971419 - 2⁹ = 18970907 is a prime.

It is a super-2 number, since 2×18971419² = 719829477747122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18971119) 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, 2229 + ... + 6550.

It is an arithmetic number, because the mean of its divisors is an integer number (4745590).

Almost surely, 2^18971419 is an apocalyptic number.

18971419 is a deficient number, since it is larger than the sum of its proper divisors (10941).

18971419 is an equidigital number, since it uses as much as digits as its factorization.

18971419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10940.

The product of its digits is 18144, while the sum is 40.

The square root of 18971419 is about 4355.6192441489. The cubic root of 18971419 is about 266.7062984499.

The spelling of 18971419 in words is "eighteen million, nine hundred seventy-one thousand, four hundred nineteen".