996459821 has 4 divisors (see below), whose sum is σ = 1138811232. Its totient is φ = 854108412.

The previous prime is 996459817. The next prime is 996459823. The reversal of 996459821 is 128954699.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 996459821 - 2² = 996459817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (996459823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71175695 + ... + 71175708.

It is an arithmetic number, because the mean of its divisors is an integer number (284702808).

Almost surely, 2^996459821 is an apocalyptic number.

It is an amenable number.

996459821 is a deficient number, since it is larger than the sum of its proper divisors (142351411).

996459821 is a wasteful number, since it uses less digits than its factorization.

996459821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142351410.

The product of its digits is 1399680, while the sum is 53.

The square root of 996459821 is about 31566.7518284666. The cubic root of 996459821 is about 998.8185450472.

The spelling of 996459821 in words is "nine hundred ninety-six million, four hundred fifty-nine thousand, eight hundred twenty-one".