18813905 has 8 divisors (see below), whose sum is σ = 24629184. Its totient is φ = 13682800.

The previous prime is 18813863. The next prime is 18813913. The reversal of 18813905 is 50931881.

18813905 is nontrivially palindromic in base 4.

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

It is not a de Polignac number, because 18813905 - 2¹⁴ = 18797521 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170981 + ... + 171090.

It is an arithmetic number, because the mean of its divisors is an integer number (3078648).

Almost surely, 2^18813905 is an apocalyptic number.

It is an amenable number.

18813905 is a deficient number, since it is larger than the sum of its proper divisors (5815279).

18813905 is a wasteful number, since it uses less digits than its factorization.

18813905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342087.

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

The square root of 18813905 is about 4337.4998559078. The cubic root of 18813905 is about 265.9661186989.

The spelling of 18813905 in words is "eighteen million, eight hundred thirteen thousand, nine hundred five".