896640921 has 20 divisors (see below), whose sum is σ = 1461194064. Its totient is φ = 543418200.

The previous prime is 896640919. The next prime is 896640929. The reversal of 896640921 is 129046698.

It is a happy number.

It is not a de Polignac number, because 896640921 - 2¹ = 896640919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (896640929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 502275 + ... + 504056.

Almost surely, 2^896640921 is an apocalyptic number.

896640921 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

896640921 is a deficient number, since it is larger than the sum of its proper divisors (564553143).

896640921 is a wasteful number, since it uses less digits than its factorization.

896640921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006354 (or 1006345 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 896640921 is about 29943.9630142705. The cubic root of 896640921 is about 964.2867185598.

The spelling of 896640921 in words is "eight hundred ninety-six million, six hundred forty thousand, nine hundred twenty-one".