18508965 has 16 divisors (see below), whose sum is σ = 29679936. Its totient is φ = 9849600.

The previous prime is 18508943. The next prime is 18508969. The reversal of 18508965 is 56980581.

It is not a de Polignac number, because 18508965 - 2⁶ = 18508901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18508969) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7485 + ... + 9645.

It is an arithmetic number, because the mean of its divisors is an integer number (1854996).

Almost surely, 2^18508965 is an apocalyptic number.

18508965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18508965 is a deficient number, since it is larger than the sum of its proper divisors (11170971).

18508965 is a wasteful number, since it uses less digits than its factorization.

18508965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2740.

The product of its (nonzero) digits is 86400, while the sum is 42.

The square root of 18508965 is about 4302.2046673769. The cubic root of 18508965 is about 264.5213383728.

The spelling of 18508965 in words is "eighteen million, five hundred eight thousand, nine hundred sixty-five".