993421 has 8 divisors (see below), whose sum is σ = 1167264. Its totient is φ = 833520.

The previous prime is 993407. The next prime is 993431. The reversal of 993421 is 124399.

It is a happy number.

993421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-993421 is a prime.

It is a Duffinian number.

993421 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 993421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (993401) 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, 3331 + ... + 3616.

It is an arithmetic number, because the mean of its divisors is an integer number (145908).

2⁹⁹³⁴²¹ is an apocalyptic number.

It is an amenable number.

993421 is a deficient number, since it is larger than the sum of its proper divisors (173843).

993421 is a wasteful number, since it uses less digits than its factorization.

993421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6971.

The product of its digits is 1944, while the sum is 28.

The square root of 993421 is about 996.7050717238. The cubic root of 993421 is about 99.7802173096.

The spelling of 993421 in words is "nine hundred ninety-three thousand, four hundred twenty-one".