18493493 has 4 divisors (see below), whose sum is σ = 18628620. Its totient is φ = 18358368.

The previous prime is 18493487. The next prime is 18493499. The reversal of 18493493 is 39439481.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (18493487) and next prime (18493499).

It can be written as a sum of positive squares in 2 ways, for example, as 14799409 + 3694084 = 3847^2 + 1922^2 .

It is a cyclic number.

It is not a de Polignac number, because 18493493 - 2⁴ = 18493477 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18493493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18493499) 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, 67358 + ... + 67631.

It is an arithmetic number, because the mean of its divisors is an integer number (4657155).

Almost surely, 2^18493493 is an apocalyptic number.

It is an amenable number.

18493493 is a deficient number, since it is larger than the sum of its proper divisors (135127).

18493493 is a wasteful number, since it uses less digits than its factorization.

18493493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135126.

The product of its digits is 93312, while the sum is 41.

The square root of 18493493 is about 4300.4061436102. The cubic root of 18493493 is about 264.4476116669.

The spelling of 18493493 in words is "eighteen million, four hundred ninety-three thousand, four hundred ninety-three".