13163865 has 96 divisors (see below), whose sum is σ = 27651456. Its totient is φ = 5253120.

The previous prime is 13163863. The next prime is 13163869. The reversal of 13163865 is 56836131.

It is not a de Polignac number, because 13163865 - 2¹ = 13163863 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (13163863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 692826 + ... + 692844.

It is an arithmetic number, because the mean of its divisors is an integer number (288036).

Almost surely, 2^13163865 is an apocalyptic number.

13163865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13163865 is an abundant number, since it is smaller than the sum of its proper divisors (14487591).

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

13163865 is a wasteful number, since it uses less digits than its factorization.

13163865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87 (or 68 counting only the distinct ones).

The product of its digits is 12960, while the sum is 33.

The square root of 13163865 is about 3628.2041012049. The cubic root of 13163865 is about 236.1172990099.

Adding to 13163865 its reverse (56836131), we get a palindrome (69999996).

It can be divided in two parts, 13163 and 865, that added together give a triangular number (14028 = T₁₆₇).

The spelling of 13163865 in words is "thirteen million, one hundred sixty-three thousand, eight hundred sixty-five".