8921985 has 16 divisors (see below), whose sum is σ = 14321664. Its totient is φ = 4742912.

The previous prime is 8921959. The next prime is 8921989. The reversal of 8921985 is 5891298.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 8921985 - 2⁸ = 8921729 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8921989) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 4969 + ... + 6521.

It is an arithmetic number, because the mean of its divisors is an integer number (895104).

Almost surely, 2^8921985 is an apocalyptic number.

It is an amenable number.

8921985 is a deficient number, since it is larger than the sum of its proper divisors (5399679).

8921985 is a wasteful number, since it uses less digits than its factorization.

8921985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1944.

The product of its digits is 51840, while the sum is 42.

The square root of 8921985 is about 2986.9691997073. The cubic root of 8921985 is about 207.4056085898.

The spelling of 8921985 in words is "eight million, nine hundred twenty-one thousand, nine hundred eighty-five".