18933242 has 4 divisors (see below), whose sum is σ = 28399866. Its totient is φ = 9466620.

The previous prime is 18933221. The next prime is 18933269. The reversal of 18933242 is 24233981.

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: 24233981 = 1889 ⋅12829.

It can be written as a sum of positive squares in only one way, i.e., 14969161 + 3964081 = 3869^2 + 1991^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18933199 and 18933208.

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, 4733309 + ... + 4733312.

Almost surely, 2^18933242 is an apocalyptic number.

18933242 is a deficient number, since it is larger than the sum of its proper divisors (9466624).

18933242 is an equidigital number, since it uses as much as digits as its factorization.

18933242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9466623.

The product of its digits is 10368, while the sum is 32.

The square root of 18933242 is about 4351.2345374618. The cubic root of 18933242 is about 266.5272768047.

The spelling of 18933242 in words is "eighteen million, nine hundred thirty-three thousand, two hundred forty-two".