18115965 has 72 divisors (see below), whose sum is σ = 38313600. Its totient is φ = 7755264.

The previous prime is 18115939. The next prime is 18115967. The reversal of 18115965 is 56951181.

It is not a de Polignac number, because 18115965 - 2⁶ = 18115901 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18115967) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 90936 + ... + 91134.

Almost surely, 2^18115965 is an apocalyptic number.

18115965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18115965 is an abundant number, since it is smaller than the sum of its proper divisors (20197635).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18115965 is a wasteful number, since it uses less digits than its factorization.

18115965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251 (or 231 counting only the distinct ones).

The product of its digits is 10800, while the sum is 36.

The square root of 18115965 is about 4256.2853522761. The cubic root of 18115965 is about 262.6357393206.

It can be divided in two parts, 1811 and 5965, that added together give a 5-th power (7776 = 6⁵).

The spelling of 18115965 in words is "eighteen million, one hundred fifteen thousand, nine hundred sixty-five".