18618493 has 8 divisors (see below), whose sum is σ = 19353600. Its totient is φ = 17889648.

The previous prime is 18618463. The next prime is 18618503. The reversal of 18618493 is 39481681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18618493 - 2¹³ = 18610301 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 (18618443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5028 + ... + 7906.

It is an arithmetic number, because the mean of its divisors is an integer number (2419200).

Almost surely, 2^18618493 is an apocalyptic number.

It is an amenable number.

18618493 is a deficient number, since it is larger than the sum of its proper divisors (735107).

18618493 is a wasteful number, since it uses less digits than its factorization.

18618493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3131.

The product of its digits is 41472, while the sum is 40.

The square root of 18618493 is about 4314.9151787723. The cubic root of 18618493 is about 265.0420865872.

The spelling of 18618493 in words is "eighteen million, six hundred eighteen thousand, four hundred ninety-three".