18424066 has 4 divisors (see below), whose sum is σ = 27636102. Its totient is φ = 9212032.

The previous prime is 18424027. The next prime is 18424067. The reversal of 18424066 is 66042481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66042481 = 521 ⋅126761.

It can be written as a sum of positive squares in only one way, i.e., 16933225 + 1490841 = 4115^2 + 1221^2 .

It is not an unprimeable number, because it can be changed into a prime (18424067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4606015 + ... + 4606018.

Almost surely, 2^18424066 is an apocalyptic number.

18424066 is a deficient number, since it is larger than the sum of its proper divisors (9212036).

18424066 is an equidigital number, since it uses as much as digits as its factorization.

18424066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9212035.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 18424066 is about 4292.3264088371. The cubic root of 18424066 is about 264.1162730097.

The spelling of 18424066 in words is "eighteen million, four hundred twenty-four thousand, sixty-six".