18049579 has 4 divisors (see below), whose sum is σ = 18094120. Its totient is φ = 18005040.

The previous prime is 18049561. The next prime is 18049583. The reversal of 18049579 is 97594081.

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 18049579 - 2¹¹ = 18047531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18049079) 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, 21657 + ... + 22474.

It is an arithmetic number, because the mean of its divisors is an integer number (4523530).

Almost surely, 2^18049579 is an apocalyptic number.

18049579 is a deficient number, since it is larger than the sum of its proper divisors (44541).

18049579 is an equidigital number, since it uses as much as digits as its factorization.

18049579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44540.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 18049579 is about 4248.4796104018. The cubic root of 18049579 is about 262.3145368723.

The spelling of 18049579 in words is "eighteen million, forty-nine thousand, five hundred seventy-nine".