989929999 has 2 divisors, whose sum is σ = 989930000. Its totient is φ = 989929998.

The previous prime is 989929981. The next prime is 989930017. The reversal of 989929999 is 999929989.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (989929981) and next prime (989930017).

It is an emirp because it is prime and its reverse (999929989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 989929999 - 2¹⁵ = 989897231 is a prime.

It is a super-2 number, since 2×989929999² = 1959922805840280002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989929909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494964999 + 494965000.

It is an arithmetic number, because the mean of its divisors is an integer number (494965000).

Almost surely, 2^989929999 is an apocalyptic number.

989929999 is a deficient number, since it is larger than the sum of its proper divisors (1).

989929999 is an equidigital number, since it uses as much as digits as its factorization.

989929999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 76527504, while the sum is 73.

The square root of 989929999 is about 31463.1530365283. The cubic root of 989929999 is about 996.6320023265.

The spelling of 989929999 in words is "nine hundred eighty-nine million, nine hundred twenty-nine thousand, nine hundred ninety-nine".