996021 has 12 divisors (see below), whose sum is σ = 1549548. Its totient is φ = 612864.

The previous prime is 996019. The next prime is 996049. The reversal of 996021 is 120699.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 617796 + 378225 = 786^2 + 615^2 .

It is not a de Polignac number, because 996021 - 2¹ = 996019 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

996021 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 996021.

It is not an unprimeable number, because it can be changed into a prime (996001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4140 + ... + 4373.

It is an arithmetic number, because the mean of its divisors is an integer number (129129).

2⁹⁹⁶⁰²¹ is an apocalyptic number.

It is an amenable number.

996021 is a deficient number, since it is larger than the sum of its proper divisors (553527).

996021 is a wasteful number, since it uses less digits than its factorization.

996021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8532 (or 8529 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 996021 is about 998.0085169977. The cubic root of 996021 is about 99.8671903607.

The spelling of 996021 in words is "nine hundred ninety-six thousand, twenty-one".