18536242 has 4 divisors (see below), whose sum is σ = 27804366. Its totient is φ = 9268120.

The previous prime is 18536201. The next prime is 18536261. The reversal of 18536242 is 24263581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24263581 = 67 ⋅362143.

It can be written as a sum of positive squares in only one way, i.e., 13995081 + 4541161 = 3741^2 + 2131^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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, 4634059 + ... + 4634062.

Almost surely, 2^18536242 is an apocalyptic number.

18536242 is a deficient number, since it is larger than the sum of its proper divisors (9268124).

18536242 is an equidigital number, since it uses as much as digits as its factorization.

18536242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9268123.

The product of its digits is 11520, while the sum is 31.

The square root of 18536242 is about 4305.3736190951. The cubic root of 18536242 is about 264.6512179020.

The spelling of 18536242 in words is "eighteen million, five hundred thirty-six thousand, two hundred forty-two".