921608 has 8 divisors (see below), whose sum is σ = 1728030. Its totient is φ = 460800.

The previous prime is 921601. The next prime is 921611. The reversal of 921608 is 806129.

It can be written as a sum of positive squares in only one way, i.e., 917764 + 3844 = 958^2 + 62^2 .

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

It is a super-2 number, since 2×921608² = 1698722611328, which contains 22 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 921608.

It is not an unprimeable number, because it can be changed into a prime (921601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57593 + ... + 57608.

921608 is a Friedman number, since it can be written as (96*10)^2+8, using all its digits and the basic arithmetic operations.

2⁹²¹⁶⁰⁸ is an apocalyptic number.

It is an amenable number.

921608 is a deficient number, since it is larger than the sum of its proper divisors (806422).

921608 is a wasteful number, since it uses less digits than its factorization.

921608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115207 (or 115203 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 921608 is about 960.0041666576. The cubic root of 921608 is about 97.3155135118.

The spelling of 921608 in words is "nine hundred twenty-one thousand, six hundred eight".