18873905 has 4 divisors (see below), whose sum is σ = 22648692. Its totient is φ = 15099120.

The previous prime is 18873889. The next prime is 18873913. The reversal of 18873905 is 50937881.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50937881 = 1259 ⋅40459.

It can be written as a sum of positive squares in 2 ways, for example, as 2745649 + 16128256 = 1657^2 + 4016^2 .

It is not a de Polignac number, because 18873905 - 2⁴ = 18873889 is a prime.

It is a Duffinian number.

It is a Curzon 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, 1887386 + ... + 1887395.

It is an arithmetic number, because the mean of its divisors is an integer number (5662173).

Almost surely, 2^18873905 is an apocalyptic number.

It is an amenable number.

18873905 is a deficient number, since it is larger than the sum of its proper divisors (3774787).

18873905 is an equidigital number, since it uses as much as digits as its factorization.

18873905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3774786.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 18873905 is about 4344.4107770790. The cubic root of 18873905 is about 266.2485522341.

The spelling of 18873905 in words is "eighteen million, eight hundred seventy-three thousand, nine hundred five".