18865965 has 16 divisors (see below), whose sum is σ = 30419136. Its totient is φ = 9984000.

The previous prime is 18865963. The next prime is 18865969. The reversal of 18865965 is 56956881.

It is not a de Polignac number, because 18865965 - 2¹ = 18865963 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18865961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2836 + ... + 6765.

It is an arithmetic number, because the mean of its divisors is an integer number (1901196).

Almost surely, 2^18865965 is an apocalyptic number.

18865965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18865965 is a deficient number, since it is larger than the sum of its proper divisors (11553171).

18865965 is a wasteful number, since it uses less digits than its factorization.

18865965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9740.

The product of its digits is 518400, while the sum is 48.

The square root of 18865965 is about 4343.4968631277. The cubic root of 18865965 is about 266.2112112595.

The spelling of 18865965 in words is "eighteen million, eight hundred sixty-five thousand, nine hundred sixty-five".