18975905 has 16 divisors (see below), whose sum is σ = 24615360. Its totient is φ = 13960128.

The previous prime is 18975881. The next prime is 18975967. The reversal of 18975905 is 50957981.

It is a happy number.

It is not a de Polignac number, because 18975905 - 2¹⁰ = 18974881 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28466 + ... + 29124.

It is an arithmetic number, because the mean of its divisors is an integer number (1538460).

Almost surely, 2^18975905 is an apocalyptic number.

It is an amenable number.

18975905 is a deficient number, since it is larger than the sum of its proper divisors (5639455).

18975905 is a wasteful number, since it uses less digits than its factorization.

18975905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1120.

The product of its (nonzero) digits is 113400, while the sum is 44.

The square root of 18975905 is about 4356.1341806698. The cubic root of 18975905 is about 266.7273186692.

The spelling of 18975905 in words is "eighteen million, nine hundred seventy-five thousand, nine hundred five".