18145906 has 8 divisors (see below), whose sum is σ = 27297900. Its totient is φ = 9046608.

The previous prime is 18145891. The next prime is 18145913. The reversal of 18145906 is 60954181.

It can be written as a sum of positive squares in 2 ways, for example, as 17935225 + 210681 = 4235^2 + 459^2 .

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

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 in 3 ways as a sum of consecutive naturals, for example, 12301 + ... + 13696.

Almost surely, 2^18145906 is an apocalyptic number.

18145906 is a deficient number, since it is larger than the sum of its proper divisors (9151994).

18145906 is a wasteful number, since it uses less digits than its factorization.

18145906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26348.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 18145906 is about 4259.8011690688. The cubic root of 18145906 is about 262.7803493095.

It can be divided in two parts, 18 and 145906, that added together give a square (145924 = 382²).

The spelling of 18145906 in words is "eighteen million, one hundred forty-five thousand, nine hundred six".