921284 has 24 divisors (see below), whose sum is σ = 1985088. Its totient is φ = 364320.

The previous prime is 921259. The next prime is 921287. The reversal of 921284 is 482129.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 921284.

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

921284 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 902 + ... + 1629.

It is an arithmetic number, because the mean of its divisors is an integer number (82712).

2⁹²¹²⁸⁴ is an apocalyptic number.

It is an amenable number.

921284 is an abundant number, since it is smaller than the sum of its proper divisors (1063804).

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

921284 is a wasteful number, since it uses less digits than its factorization.

921284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2555 (or 2553 counting only the distinct ones).

The product of its digits is 1152, while the sum is 26.

The square root of 921284 is about 959.8354025561. The cubic root of 921284 is about 97.3041081124.

The spelling of 921284 in words is "nine hundred twenty-one thousand, two hundred eighty-four".