821265 has 8 divisors (see below), whose sum is σ = 1314048. Its totient is φ = 438000.

The previous prime is 821263. The next prime is 821281. The reversal of 821265 is 562128.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 821265 - 2¹ = 821263 is a prime.

It is a super-3 number, since 3×821265³ = 1661771089733353875, which contains 333 as substring.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (821263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27361 + ... + 27390.

It is an arithmetic number, because the mean of its divisors is an integer number (164256).

2⁸²¹²⁶⁵ is an apocalyptic number.

It is an amenable number.

821265 is a deficient number, since it is larger than the sum of its proper divisors (492783).

821265 is a wasteful number, since it uses less digits than its factorization.

821265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54759.

The product of its digits is 960, while the sum is 24.

The square root of 821265 is about 906.2367240407. The cubic root of 821265 is about 93.6471227036.

The spelling of 821265 in words is "eight hundred twenty-one thousand, two hundred sixty-five".