18768905 has 4 divisors (see below), whose sum is σ = 22522692. Its totient is φ = 15015120.

The previous prime is 18768859. The next prime is 18768917. The reversal of 18768905 is 50986781.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5071504 + 13697401 = 2252^2 + 3701^2 .

It is not a de Polignac number, because 18768905 - 2¹⁶ = 18703369 is a prime.

It is a Duffinian number.

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, 1876886 + ... + 1876895.

It is an arithmetic number, because the mean of its divisors is an integer number (5630673).

Almost surely, 2^18768905 is an apocalyptic number.

It is an amenable number.

18768905 is a deficient number, since it is larger than the sum of its proper divisors (3753787).

18768905 is an equidigital number, since it uses as much as digits as its factorization.

18768905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3753786.

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 18768905 is about 4332.3094303154. The cubic root of 18768905 is about 265.7538992386.

The spelling of 18768905 in words is "eighteen million, seven hundred sixty-eight thousand, nine hundred five".