989409829 has 2 divisors, whose sum is σ = 989409830. Its totient is φ = 989409828.

The previous prime is 989409821. The next prime is 989409931. The reversal of 989409829 is 928904989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 501088225 + 488321604 = 22385^2 + 22098^2 .

It is a cyclic number.

It is not a de Polignac number, because 989409829 - 2³ = 989409821 is a prime.

It is a super-4 number, since 4×989409829⁴ (a number of 37 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989409821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494704914 + 494704915.

It is an arithmetic number, because the mean of its divisors is an integer number (494704915).

Almost surely, 2^989409829 is an apocalyptic number.

It is an amenable number.

989409829 is a deficient number, since it is larger than the sum of its proper divisors (1).

989409829 is an equidigital number, since it uses as much as digits as its factorization.

989409829 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3359232, while the sum is 58.

The square root of 989409829 is about 31454.8856141618. The cubic root of 989409829 is about 996.4574078607.

The spelling of 989409829 in words is "nine hundred eighty-nine million, four hundred nine thousand, eight hundred twenty-nine".