921289 has 8 divisors (see below), whose sum is σ = 963072. Its totient is φ = 880320.

The previous prime is 921287. The next prime is 921293. The reversal of 921289 is 982129.

921289 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 921289 - 2¹ = 921287 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 921289.

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 7 ways as a sum of consecutive naturals, for example, 3372 + ... + 3634.

It is an arithmetic number, because the mean of its divisors is an integer number (120384).

2⁹²¹²⁸⁹ is an apocalyptic number.

It is an amenable number.

921289 is a deficient number, since it is larger than the sum of its proper divisors (41783).

921289 is a wasteful number, since it uses less digits than its factorization.

921289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407.

The product of its digits is 2592, while the sum is 31.

The square root of 921289 is about 959.8380071658. The cubic root of 921289 is about 97.3042841419.

The spelling of 921289 in words is "nine hundred twenty-one thousand, two hundred eighty-nine".