989878469 has 2 divisors, whose sum is σ = 989878470. Its totient is φ = 989878468.

The previous prime is 989878451. The next prime is 989878481. The reversal of 989878469 is 964878989.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 989857444 + 21025 = 31462^2 + 145^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-989878469 is a prime.

It is a super-2 number, since 2×989878469² = 1959718766779567922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 989878399 and 989878408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989878969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494939234 + 494939235.

It is an arithmetic number, because the mean of its divisors is an integer number (494939235).

Almost surely, 2^989878469 is an apocalyptic number.

It is an amenable number.

989878469 is a deficient number, since it is larger than the sum of its proper divisors (1).

989878469 is an equidigital number, since it uses as much as digits as its factorization.

989878469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62705664, while the sum is 68.

The square root of 989878469 is about 31462.3341314658. The cubic root of 989878469 is about 996.6147090707.

The spelling of 989878469 in words is "nine hundred eighty-nine million, eight hundred seventy-eight thousand, four hundred sixty-nine".