18540349 has 4 divisors (see below), whose sum is σ = 18686464. Its totient is φ = 18394236.

The previous prime is 18540343. The next prime is 18540377. The reversal of 18540349 is 94304581.

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.

It is a cyclic number.

It is not a de Polignac number, because 18540349 - 2³ = 18540341 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 (18540341) 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, 72867 + ... + 73120.

It is an arithmetic number, because the mean of its divisors is an integer number (4671616).

Almost surely, 2^18540349 is an apocalyptic number.

It is an amenable number.

18540349 is a deficient number, since it is larger than the sum of its proper divisors (146115).

18540349 is a wasteful number, since it uses less digits than its factorization.

18540349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146114.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 18540349 is about 4305.8505547685. The cubic root of 18540349 is about 264.6707623578.

The spelling of 18540349 in words is "eighteen million, five hundred forty thousand, three hundred forty-nine".