18648506 has 4 divisors (see below), whose sum is σ = 27972762. Its totient is φ = 9324252.

The previous prime is 18648499. The next prime is 18648521. The reversal of 18648506 is 60584681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60584681 = 59 ⋅1026859.

It can be written as a sum of positive squares in only one way, i.e., 17147881 + 1500625 = 4141^2 + 1225^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18648506.

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, 4662125 + ... + 4662128.

Almost surely, 2^18648506 is an apocalyptic number.

18648506 is a deficient number, since it is larger than the sum of its proper divisors (9324256).

18648506 is an equidigital number, since it uses as much as digits as its factorization.

18648506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9324255.

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 18648506 is about 4318.3915987321. The cubic root of 18648506 is about 265.1844260279.

The spelling of 18648506 in words is "eighteen million, six hundred forty-eight thousand, five hundred six".