18019906 has 8 divisors (see below), whose sum is σ = 27070524. Its totient is φ = 8996400.

The previous prime is 18019901. The next prime is 18019907. The reversal of 18019906 is 60991081.

It can be written as a sum of positive squares in 2 ways, for example, as 17935225 + 84681 = 4235^2 + 291^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (18019901) 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 in 3 ways as a sum of consecutive naturals, for example, 5025 + ... + 7828.

Almost surely, 2^18019906 is an apocalyptic number.

18019906 is a deficient number, since it is larger than the sum of its proper divisors (9050618).

18019906 is a wasteful number, since it uses less digits than its factorization.

18019906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13556.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 18019906 is about 4244.9859834869. The cubic root of 18019906 is about 262.1707121230.

The spelling of 18019906 in words is "eighteen million, nineteen thousand, nine hundred six".