996921 has 8 divisors (see below), whose sum is σ = 1476960. Its totient is φ = 664596.

The previous prime is 996899. The next prime is 996953. The reversal of 996921 is 129699.

It is not a de Polignac number, because 996921 - 2⁶ = 996857 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 996921.

It is not an unprimeable number, because it can be changed into a prime (926921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18435 + ... + 18488.

It is an arithmetic number, because the mean of its divisors is an integer number (184620).

2⁹⁹⁶⁹²¹ is an apocalyptic number.

It is an amenable number.

996921 is a deficient number, since it is larger than the sum of its proper divisors (480039).

996921 is a wasteful number, since it uses less digits than its factorization.

996921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36932 (or 36926 counting only the distinct ones).

The product of its digits is 8748, while the sum is 36.

The square root of 996921 is about 998.4593131420. The cubic root of 996921 is about 99.8972611501.

The spelling of 996921 in words is "nine hundred ninety-six thousand, nine hundred twenty-one".