989870105 has 24 divisors (see below), whose sum is σ = 1390821696. Its totient is φ = 662165280.

The previous prime is 989870087. The next prime is 989870117. The reversal of 989870105 is 501078989.

It is a happy number.

It is not a de Polignac number, because 989870105 - 2⁶ = 989870041 is a prime.

It is a super-2 number, since 2×989870105² = 1959685649545422050, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 989870105.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1220150 + ... + 1220960.

It is an arithmetic number, because the mean of its divisors is an integer number (57950904).

Almost surely, 2^989870105 is an apocalyptic number.

It is an amenable number.

989870105 is a deficient number, since it is larger than the sum of its proper divisors (400951591).

989870105 is an frugal number, since it uses more digits than its factorization.

989870105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1677 (or 866 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 47.

The square root of 989870105 is about 31462.2012103413. The cubic root of 989870105 is about 996.6119020901.

The spelling of 989870105 in words is "nine hundred eighty-nine million, eight hundred seventy thousand, one hundred five".