18994282 has 4 divisors (see below), whose sum is σ = 28491426. Its totient is φ = 9497140.

The previous prime is 18994277. The next prime is 18994303. The reversal of 18994282 is 28249981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 28249981 = 37 ⋅763513.

It can be written as a sum of positive squares in only one way, i.e., 10297681 + 8696601 = 3209^2 + 2949^2 .

It is an unprimeable number.

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, 4748569 + ... + 4748572.

Almost surely, 2^18994282 is an apocalyptic number.

18994282 is a deficient number, since it is larger than the sum of its proper divisors (9497144).

18994282 is an equidigital number, since it uses as much as digits as its factorization.

18994282 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9497143.

The product of its digits is 82944, while the sum is 43.

The square root of 18994282 is about 4358.2429946023. The cubic root of 18994282 is about 266.8133939047.

The spelling of 18994282 in words is "eighteen million, nine hundred ninety-four thousand, two hundred eighty-two".