989439975479 has 2 divisors, whose sum is σ = 989439975480. Its totient is φ = 989439975478.

The previous prime is 989439975373. The next prime is 989439975529. The reversal of 989439975479 is 974579934989.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 989439975479 - 2²⁴ = 989423198263 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 989439975397 and 989439975406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989439945479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494719987739 + 494719987740.

It is an arithmetic number, because the mean of its divisors is an integer number (494719987740).

Almost surely, 2^989439975479 is an apocalyptic number.

989439975479 is a deficient number, since it is larger than the sum of its proper divisors (1).

989439975479 is an equidigital number, since it uses as much as digits as its factorization.

989439975479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5555329920, while the sum is 83.

The spelling of 989439975479 in words is "nine hundred eighty-nine billion, four hundred thirty-nine million, nine hundred seventy-five thousand, four hundred seventy-nine".