18488906 has 4 divisors (see below), whose sum is σ = 27733362. Its totient is φ = 9244452.

The previous prime is 18488903. The next prime is 18488933. The reversal of 18488906 is 60988481.

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: 60988481 = 283 ⋅215507.

It can be written as a sum of positive squares in only one way, i.e., 12924025 + 5564881 = 3595^2 + 2359^2 .

It is not an unprimeable number, because it can be changed into a prime (18488903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4622225 + ... + 4622228.

Almost surely, 2^18488906 is an apocalyptic number.

18488906 is a deficient number, since it is larger than the sum of its proper divisors (9244456).

18488906 is an equidigital number, since it uses as much as digits as its factorization.

18488906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9244455.

The product of its (nonzero) digits is 110592, while the sum is 44.

The square root of 18488906 is about 4299.8727888160. The cubic root of 18488906 is about 264.4257459310.

The spelling of 18488906 in words is "eighteen million, four hundred eighty-eight thousand, nine hundred six".