18995965 has 4 divisors (see below), whose sum is σ = 22795164. Its totient is φ = 15196768.

The previous prime is 18995947. The next prime is 18995971. The reversal of 18995965 is 56959981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56959981 = 13 ⋅4381537.

It can be written as a sum of positive squares in 2 ways, for example, as 14661241 + 4334724 = 3829^2 + 2082^2 .

It is a cyclic number.

It is not a de Polignac number, because 18995965 - 2⁹ = 18995453 is a prime.

It is a Duffinian number.

It is a congruent 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, 1899592 + ... + 1899601.

It is an arithmetic number, because the mean of its divisors is an integer number (5698791).

Almost surely, 2^18995965 is an apocalyptic number.

It is an amenable number.

18995965 is a deficient number, since it is larger than the sum of its proper divisors (3799199).

18995965 is an equidigital number, since it uses as much as digits as its factorization.

18995965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3799198.

The product of its digits is 874800, while the sum is 52.

The square root of 18995965 is about 4358.4360727215. The cubic root of 18995965 is about 266.8212740600.

The spelling of 18995965 in words is "eighteen million, nine hundred ninety-five thousand, nine hundred sixty-five".