921285 has 24 divisors (see below), whose sum is σ = 1628640. Its totient is φ = 481632.

The previous prime is 921259. The next prime is 921287. The reversal of 921285 is 582129.

921285 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 921285 - 2⁷ = 921157 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 921285.

It is not an unprimeable number, because it can be changed into a prime (921287) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2482 + ... + 2828.

It is an arithmetic number, because the mean of its divisors is an integer number (67860).

2⁹²¹²⁸⁵ is an apocalyptic number.

It is an amenable number.

921285 is a deficient number, since it is larger than the sum of its proper divisors (707355).

921285 is a wasteful number, since it uses less digits than its factorization.

921285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417 (or 414 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 921285 is about 959.8359234786. The cubic root of 921285 is about 97.3041433183.

The spelling of 921285 in words is "nine hundred twenty-one thousand, two hundred eighty-five".