18540849 has 4 divisors (see below), whose sum is σ = 24721136. Its totient is φ = 12360564.

The previous prime is 18540839. The next prime is 18540877. The reversal of 18540849 is 94804581.

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: 94804581 = 3 ⋅31601527.

It is not a de Polignac number, because 18540849 - 2⁴ = 18540833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18540839) 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, 3090139 + ... + 3090144.

It is an arithmetic number, because the mean of its divisors is an integer number (6180284).

Almost surely, 2^18540849 is an apocalyptic number.

It is an amenable number.

18540849 is a deficient number, since it is larger than the sum of its proper divisors (6180287).

18540849 is an equidigital number, since it uses as much as digits as its factorization.

18540849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6180286.

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 18540849 is about 4305.9086149151. The cubic root of 18540849 is about 264.6731415686.

The spelling of 18540849 in words is "eighteen million, five hundred forty thousand, eight hundred forty-nine".