989829409 has 2 divisors, whose sum is σ = 989829410. Its totient is φ = 989829408.

The previous prime is 989829359. The next prime is 989829469. The reversal of 989829409 is 904928989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 839840400 + 149989009 = 28980^2 + 12247^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-989829409 is a prime.

It is not a weakly prime, because it can be changed into another prime (989829469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494914704 + 494914705.

It is an arithmetic number, because the mean of its divisors is an integer number (494914705).

Almost surely, 2^989829409 is an apocalyptic number.

It is an amenable number.

989829409 is a deficient number, since it is larger than the sum of its proper divisors (1).

989829409 is an equidigital number, since it uses as much as digits as its factorization.

989829409 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 989829409 is about 31461.5544593715. The cubic root of 989829409 is about 996.5982441790.

The spelling of 989829409 in words is "nine hundred eighty-nine million, eight hundred twenty-nine thousand, four hundred nine".