921072 has 40 divisors (see below), whose sum is σ = 2460160. Its totient is φ = 296640.

The previous prime is 921031. The next prime is 921073. The reversal of 921072 is 270129.

It is a happy number.

921072 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921073) by changing a digit.

921072 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, 1179 + ... + 1797.

It is an arithmetic number, because the mean of its divisors is an integer number (61504).

2⁹²¹⁰⁷² 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 921072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1230080).

921072 is an abundant number, since it is smaller than the sum of its proper divisors (1539088).

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

921072 is a wasteful number, since it uses less digits than its factorization.

921072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661 (or 655 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 921072 is about 959.7249606007. The cubic root of 921072 is about 97.2966438728.

The spelling of 921072 in words is "nine hundred twenty-one thousand, seventy-two".