18394441 has 4 divisors (see below), whose sum is σ = 19809412. Its totient is φ = 16979472.

The previous prime is 18394429. The next prime is 18394447. The reversal of 18394441 is 14449381.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5405625 + 12988816 = 2325^2 + 3604^2 .

It is a cyclic number.

It is not a de Polignac number, because 18394441 - 2⁹ = 18393929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18394397 and 18394406.

It is not an unprimeable number, because it can be changed into a prime (18394447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 707466 + ... + 707491.

It is an arithmetic number, because the mean of its divisors is an integer number (4952353).

Almost surely, 2^18394441 is an apocalyptic number.

It is an amenable number.

18394441 is a deficient number, since it is larger than the sum of its proper divisors (1414971).

18394441 is a wasteful number, since it uses less digits than its factorization.

18394441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1414970.

The product of its digits is 13824, while the sum is 34.

The square root of 18394441 is about 4288.8740946780. The cubic root of 18394441 is about 263.9746350362.

The spelling of 18394441 in words is "eighteen million, three hundred ninety-four thousand, four hundred forty-one".