993878965 has 4 divisors (see below), whose sum is σ = 1192654764. Its totient is φ = 795103168.

The previous prime is 993878929. The next prime is 993878969. The reversal of 993878965 is 569878399.

It is a happy number.

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 306705169 + 687173796 = 17513^2 + 26214^2 .

It is a cyclic number.

It is not a de Polignac number, because 993878965 - 2⁹ = 993878453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 993878897 and 993878906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (993878969) 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 3 ways as a sum of consecutive naturals, for example, 99387892 + ... + 99387901.

It is an arithmetic number, because the mean of its divisors is an integer number (298163691).

Almost surely, 2^993878965 is an apocalyptic number.

It is an amenable number.

993878965 is a deficient number, since it is larger than the sum of its proper divisors (198775799).

993878965 is a wasteful number, since it uses less digits than its factorization.

993878965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198775798.

The product of its digits is 29393280, while the sum is 64.

The square root of 993878965 is about 31525.8459838907. The cubic root of 993878965 is about 997.9554777776.

The spelling of 993878965 in words is "nine hundred ninety-three million, eight hundred seventy-eight thousand, nine hundred sixty-five".