988667993 has 4 divisors (see below), whose sum is σ = 989637348. Its totient is φ = 987698640.

The previous prime is 988667969. The next prime is 988668001. The reversal of 988667993 is 399766889.

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 343101529 + 645566464 = 18523^2 + 25408^2 .

It is a cyclic number.

It is not a de Polignac number, because 988667993 - 2⁸ = 988667737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (988667893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 483146 + ... + 485187.

It is an arithmetic number, because the mean of its divisors is an integer number (247409337).

Almost surely, 2^988667993 is an apocalyptic number.

It is an amenable number.

988667993 is a deficient number, since it is larger than the sum of its proper divisors (969355).

988667993 is a wasteful number, since it uses less digits than its factorization.

988667993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 969354.

The product of its digits is 35271936, while the sum is 65.

The square root of 988667993 is about 31443.0913397522. The cubic root of 988667993 is about 996.2083055576.

The spelling of 988667993 in words is "nine hundred eighty-eight million, six hundred sixty-seven thousand, nine hundred ninety-three".