921798 has 24 divisors (see below), whose sum is σ = 2024568. Its totient is φ = 303072.

The previous prime is 921787. The next prime is 921821. The reversal of 921798 is 897129.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

921798 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 11 ways as a sum of consecutive naturals, for example, 1186 + ... + 1802.

It is an arithmetic number, because the mean of its divisors is an integer number (84357).

2⁹²¹⁷⁹⁸ is an apocalyptic number.

921798 is an abundant number, since it is smaller than the sum of its proper divisors (1102770).

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

921798 is a wasteful number, since it uses less digits than its factorization.

921798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708 (or 705 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 921798 is about 960.1031194617. The cubic root of 921798 is about 97.3222006199.

The spelling of 921798 in words is "nine hundred twenty-one thousand, seven hundred ninety-eight".