18044413 has 4 divisors (see below), whose sum is σ = 18083520. Its totient is φ = 18005308.

The previous prime is 18044401. The next prime is 18044423. The reversal of 18044413 is 31444081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31444081 = 47 ⋅669023.

It is a cyclic number.

It is not a de Polignac number, because 18044413 - 2¹⁷ = 17913341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18044423) 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, 18853 + ... + 19786.

It is an arithmetic number, because the mean of its divisors is an integer number (4520880).

Almost surely, 2^18044413 is an apocalyptic number.

It is an amenable number.

18044413 is a deficient number, since it is larger than the sum of its proper divisors (39107).

18044413 is an equidigital number, since it uses as much as digits as its factorization.

18044413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39106.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 18044413 is about 4247.8715846880. The cubic root of 18044413 is about 262.2895086579.

Adding to 18044413 its reverse (31444081), we get a palindrome (49488494).

The spelling of 18044413 in words is "eighteen million, forty-four thousand, four hundred thirteen".