993994421 has 8 divisors (see below), whose sum is σ = 1144167360. Its totient is φ = 845864928.

The previous prime is 993994411. The next prime is 993994433. The reversal of 993994421 is 124499399.

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-993994421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 993994421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (993994411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 509816 + ... + 511761.

It is an arithmetic number, because the mean of its divisors is an integer number (143020920).

Almost surely, 2^993994421 is an apocalyptic number.

It is an amenable number.

993994421 is a deficient number, since it is larger than the sum of its proper divisors (150172939).

993994421 is a wasteful number, since it uses less digits than its factorization.

993994421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021723.

The product of its digits is 629856, while the sum is 50.

The square root of 993994421 is about 31527.6770631774. The cubic root of 993994421 is about 997.9941194669.

The spelling of 993994421 in words is "nine hundred ninety-three million, nine hundred ninety-four thousand, four hundred twenty-one".