18411919 has 4 divisors (see below), whose sum is σ = 18552600. Its totient is φ = 18271240.

The previous prime is 18411907. The next prime is 18411929. The reversal of 18411919 is 91911481.

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 18411919 - 2¹¹ = 18409871 is a prime.

It is a super-2 number, since 2×18411919² = 677997522525122, which 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 (18411929) 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, 70144 + ... + 70405.

It is an arithmetic number, because the mean of its divisors is an integer number (4638150).

Almost surely, 2^18411919 is an apocalyptic number.

18411919 is a deficient number, since it is larger than the sum of its proper divisors (140681).

18411919 is a wasteful number, since it uses less digits than its factorization.

18411919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140680.

The product of its digits is 2592, while the sum is 34.

The square root of 18411919 is about 4290.9112085896. The cubic root of 18411919 is about 264.0582162325.

The spelling of 18411919 in words is "eighteen million, four hundred eleven thousand, nine hundred nineteen".