921992 has 8 divisors (see below), whose sum is σ = 1728750. Its totient is φ = 460992.

The previous prime is 921989. The next prime is 922021. The reversal of 921992 is 299129.

It can be written as a sum of positive squares in only one way, i.e., 857476 + 64516 = 926^2 + 254^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57617 + ... + 57632.

2⁹²¹⁹⁹² is an apocalyptic number.

It is an amenable number.

921992 is a deficient number, since it is larger than the sum of its proper divisors (806758).

921992 is a wasteful number, since it uses less digits than its factorization.

921992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115255 (or 115251 counting only the distinct ones).

The product of its digits is 2916, while the sum is 32.

The square root of 921992 is about 960.2041449609. The cubic root of 921992 is about 97.3290275612.

The spelling of 921992 in words is "nine hundred twenty-one thousand, nine hundred ninety-two".