989393639843 has 4 divisors (see below), whose sum is σ = 1130735588400. Its totient is φ = 848051691288.

The previous prime is 989393639837. The next prime is 989393639849. The reversal of 989393639843 is 348936393989.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (989393639837) and next prime (989393639849).

It is a cyclic number.

It is not a de Polignac number, because 989393639843 - 2¹⁴ = 989393623459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (989393639849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70670974268 + ... + 70670974281.

It is an arithmetic number, because the mean of its divisors is an integer number (282683897100).

Almost surely, 2^989393639843 is an apocalyptic number.

989393639843 is a deficient number, since it is larger than the sum of its proper divisors (141341948557).

989393639843 is a wasteful number, since it uses less digits than its factorization.

989393639843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141341948556.

The product of its digits is 816293376, while the sum is 74.

The spelling of 989393639843 in words is "nine hundred eighty-nine billion, three hundred ninety-three million, six hundred thirty-nine thousand, eight hundred forty-three".