996421 has 4 divisors (see below), whose sum is σ = 1055052. Its totient is φ = 937792.

The previous prime is 996409. The next prime is 996431. The reversal of 996421 is 124699.

996421 = 114² + 115² + ... + 164².

It is a happy number.

996421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 923521 + 72900 = 961^2 + 270^2 .

It is a cyclic number.

It is not a de Polignac number, because 996421 - 2⁷ = 996293 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (996431) 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, 29290 + ... + 29323.

It is an arithmetic number, because the mean of its divisors is an integer number (263763).

2⁹⁹⁶⁴²¹ is an apocalyptic number.

It is an amenable number.

996421 is a deficient number, since it is larger than the sum of its proper divisors (58631).

996421 is a wasteful number, since it uses less digits than its factorization.

996421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58630.

The product of its digits is 3888, while the sum is 31.

The square root of 996421 is about 998.2088959732. The cubic root of 996421 is about 99.8805573914.

The spelling of 996421 in words is "nine hundred ninety-six thousand, four hundred twenty-one".