18842986 has 4 divisors (see below), whose sum is σ = 28264482. Its totient is φ = 9421492.

The previous prime is 18842981. The next prime is 18843023. The reversal of 18842986 is 68924881.

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

It can be written as a sum of positive squares in only one way, i.e., 18653761 + 189225 = 4319^2 + 435^2 .

It is not an unprimeable number, because it can be changed into a prime (18842981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4710745 + ... + 4710748.

Almost surely, 2^18842986 is an apocalyptic number.

18842986 is a deficient number, since it is larger than the sum of its proper divisors (9421496).

18842986 is an equidigital number, since it uses as much as digits as its factorization.

18842986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9421495.

The product of its digits is 221184, while the sum is 46.

The square root of 18842986 is about 4340.8508382574. The cubic root of 18842986 is about 266.1030843982.

The spelling of 18842986 in words is "eighteen million, eight hundred forty-two thousand, nine hundred eighty-six".