18905138 has 8 divisors (see below), whose sum is σ = 32408832. Its totient is φ = 8102196.

The previous prime is 18905119. The next prime is 18905143. The reversal of 18905138 is 83150981.

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

It is a junction number, because it is equal to n+sod(n) for n = 18905098 and 18905107.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 675170 + ... + 675197.

It is an arithmetic number, because the mean of its divisors is an integer number (4051104).

Almost surely, 2^18905138 is an apocalyptic number.

18905138 is a deficient number, since it is larger than the sum of its proper divisors (13503694).

18905138 is a wasteful number, since it uses less digits than its factorization.

18905138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1350376.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 18905138 is about 4348.0039098418. The cubic root of 18905138 is about 266.3953361705.

The spelling of 18905138 in words is "eighteen million, nine hundred five thousand, one hundred thirty-eight".