993664399 has 24 divisors (see below), whose sum is σ = 1302052320. Its totient is φ = 739934208.

The previous prime is 993664391. The next prime is 993664403. The reversal of 993664399 is 993466399.

It is not a de Polignac number, because 993664399 - 2³ = 993664391 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 (993664391) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4594 + ... + 44815.

It is an arithmetic number, because the mean of its divisors is an integer number (54252180).

Almost surely, 2^993664399 is an apocalyptic number.

993664399 is a deficient number, since it is larger than the sum of its proper divisors (308387921).

993664399 is a wasteful number, since it uses less digits than its factorization.

993664399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49459 (or 49446 counting only the distinct ones).

The product of its digits is 8503056, while the sum is 58.

The square root of 993664399 is about 31522.4427828809. The cubic root of 993664399 is about 997.8836572530.

The spelling of 993664399 in words is "nine hundred ninety-three million, six hundred sixty-four thousand, three hundred ninety-nine".