18885494 has 4 divisors (see below), whose sum is σ = 28328244. Its totient is φ = 9442746.

The previous prime is 18885473. The next prime is 18885497. The reversal of 18885494 is 49458881.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49458881 = 19 ⋅2603099.

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 as a sum of consecutive naturals, namely, 4721372 + ... + 4721375.

It is an arithmetic number, because the mean of its divisors is an integer number (7082061).

Almost surely, 2^18885494 is an apocalyptic number.

18885494 is a deficient number, since it is larger than the sum of its proper divisors (9442750).

18885494 is an equidigital number, since it uses as much as digits as its factorization.

18885494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9442749.

The product of its digits is 368640, while the sum is 47.

The square root of 18885494 is about 4345.7443551134. The cubic root of 18885494 is about 266.3030352740.

The spelling of 18885494 in words is "eighteen million, eight hundred eighty-five thousand, four hundred ninety-four".