921088 has 40 divisors (see below), whose sum is σ = 2111472. Its totient is φ = 393216.

The previous prime is 921079. The next prime is 921091. The reversal of 921088 is 880129.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

921088 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 3 ways as a sum of consecutive naturals, for example, 3456 + ... + 3712.

2⁹²¹⁰⁸⁸ 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 921088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1055736).

921088 is an abundant number, since it is smaller than the sum of its proper divisors (1190384).

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

921088 is an equidigital number, since it uses as much as digits as its factorization.

921088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282 (or 266 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 921088 is about 959.7332962860. The cubic root of 921088 is about 97.2972072516.

921088 divided by its sum of digits (28) gives a triangular number (32896 = T₂₅₆).

The spelling of 921088 in words is "nine hundred twenty-one thousand, eighty-eight".