18885493 has 8 divisors (see below), whose sum is σ = 21041280. Its totient is φ = 16802880.

The previous prime is 18885473. The next prime is 18885497. The reversal of 18885493 is 39458881.

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 18885493 - 2⁹ = 18884981 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 (18885497) 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 7 ways as a sum of consecutive naturals, for example, 17748 + ... + 18781.

It is an arithmetic number, because the mean of its divisors is an integer number (2630160).

Almost surely, 2^18885493 is an apocalyptic number.

It is an amenable number.

18885493 is a deficient number, since it is larger than the sum of its proper divisors (2155787).

18885493 is a wasteful number, since it uses less digits than its factorization.

18885493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36587.

The product of its digits is 276480, while the sum is 46.

The square root of 18885493 is about 4345.7442400583. The cubic root of 18885493 is about 266.3030305736.

It can be divided in two parts, 1888 and 5493, that added together give a triangular number (7381 = T₁₂₁).

The spelling of 18885493 in words is "eighteen million, eight hundred eighty-five thousand, four hundred ninety-three".