18029906 has 4 divisors (see below), whose sum is σ = 27044862. Its totient is φ = 9014952.

The previous prime is 18029899. The next prime is 18029927. The reversal of 18029906 is 60992081.

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., 15673681 + 2356225 = 3959^2 + 1535^2 .

It is a Curzon number.

It is an unprimeable number.

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, 4507475 + ... + 4507478.

Almost surely, 2^18029906 is an apocalyptic number.

18029906 is a deficient number, since it is larger than the sum of its proper divisors (9014956).

18029906 is an equidigital number, since it uses as much as digits as its factorization.

18029906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9014955.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 18029906 is about 4246.1636803119. The cubic root of 18029906 is about 262.2191996550.

The spelling of 18029906 in words is "eighteen million, twenty-nine thousand, nine hundred six".