265816 has 16 divisors (see below), whose sum is σ = 504000. Its totient is φ = 131424.

The previous prime is 265813. The next prime is 265819. The reversal of 265816 is 618562.

It is an interprime number because it is at equal distance from previous prime (265813) and next prime (265819).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1081 + ... + 1303.

It is an arithmetic number, because the mean of its divisors is an integer number (31500).

2²⁶⁵⁸¹⁶ is an apocalyptic number.

265816 is the 298-th octagonal number.

It is an amenable number.

265816 is a deficient number, since it is larger than the sum of its proper divisors (238184).

265816 is a wasteful number, since it uses less digits than its factorization.

265816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378 (or 374 counting only the distinct ones).

The product of its digits is 2880, while the sum is 28.

The square root of 265816 is about 515.5734671218. The cubic root of 265816 is about 64.2974435976.

It can be divided in two parts, 265 and 816, that added together give a triangular number (1081 = T₄₆).

The spelling of 265816 in words is "two hundred sixty-five thousand, eight hundred sixteen".