921000 has 64 divisors (see below), whose sum is σ = 2882880. Its totient is φ = 244800.

The previous prime is 920999. The next prime is 921001. The reversal of 921000 is 129.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (920999) and next prime (921001).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (921001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2847 + ... + 3153.

It is an arithmetic number, because the mean of its divisors is an integer number (45045).

2⁹²¹⁰⁰⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 921000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1441440).

921000 is an abundant number, since it is smaller than the sum of its proper divisors (1961880).

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

921000 is a wasteful number, since it uses less digits than its factorization.

921000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331 (or 317 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 921000 is about 959.6874491208. The cubic root of 921000 is about 97.2941085875.

Adding to 921000 its reverse (129), we get a palindrome (921129).

The spelling of 921000 in words is "nine hundred twenty-one thousand".