18514393 has 4 divisors (see below), whose sum is σ = 19014820. Its totient is φ = 18013968.

The previous prime is 18514387. The next prime is 18514399. The reversal of 18514393 is 39341581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39341581 = 863 ⋅45587.

It is an interprime number because it is at equal distance from previous prime (18514387) and next prime (18514399).

It can be written as a sum of positive squares in 2 ways, for example, as 17405584 + 1108809 = 4172^2 + 1053^2 .

It is not a de Polignac number, because 18514393 - 2⁹ = 18513881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18514399) 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, 250158 + ... + 250231.

It is an arithmetic number, because the mean of its divisors is an integer number (4753705).

Almost surely, 2^18514393 is an apocalyptic number.

It is an amenable number.

18514393 is a deficient number, since it is larger than the sum of its proper divisors (500427).

18514393 is an equidigital number, since it uses as much as digits as its factorization.

18514393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500426.

The product of its digits is 12960, while the sum is 34.

The square root of 18514393 is about 4302.8354604842. The cubic root of 18514393 is about 264.5471939783.

The spelling of 18514393 in words is "eighteen million, five hundred fourteen thousand, three hundred ninety-three".