18658442 has 12 divisors (see below), whose sum is σ = 30763698. Its totient is φ = 8481000.

The previous prime is 18658433. The next prime is 18658477. The reversal of 18658442 is 24485681.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12313081 + 6345361 = 3509^2 + 2519^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18658396 and 18658405.

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 in 5 ways as a sum of consecutive naturals, for example, 38309 + ... + 38792.

Almost surely, 2^18658442 is an apocalyptic number.

18658442 is a deficient number, since it is larger than the sum of its proper divisors (12105256).

18658442 is a wasteful number, since it uses less digits than its factorization.

18658442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77125 (or 77114 counting only the distinct ones).

The product of its digits is 61440, while the sum is 38.

The square root of 18658442 is about 4319.5418738565. The cubic root of 18658442 is about 265.2315147802.

The spelling of 18658442 in words is "eighteen million, six hundred fifty-eight thousand, four hundred forty-two".