18419242 has 4 divisors (see below), whose sum is σ = 27628866. Its totient is φ = 9209620.

The previous prime is 18419221. The next prime is 18419243. The reversal of 18419242 is 24291481.

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., 18412681 + 6561 = 4291^2 + 81^2 .

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 not an unprimeable number, because it can be changed into a prime (18419243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4604809 + ... + 4604812.

Almost surely, 2^18419242 is an apocalyptic number.

18419242 is a deficient number, since it is larger than the sum of its proper divisors (9209624).

18419242 is an equidigital number, since it uses as much as digits as its factorization.

18419242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9209623.

The product of its digits is 4608, while the sum is 31.

The square root of 18419242 is about 4291.7644390157. The cubic root of 18419242 is about 264.0932196816.

The spelling of 18419242 in words is "eighteen million, four hundred nineteen thousand, two hundred forty-two".