989958123 has 144 divisors (see below), whose sum is σ = 1946280960. Its totient is φ = 478396800.

The previous prime is 989958119. The next prime is 989958163. The reversal of 989958123 is 321859989.

It is not a de Polignac number, because 989958123 - 2² = 989958119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 989958123.

It is not an unprimeable number, because it can be changed into a prime (989958103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 4360936 + ... + 4361162.

It is an arithmetic number, because the mean of its divisors is an integer number (13515840).

Almost surely, 2^989958123 is an apocalyptic number.

989958123 is a gapful number since it is divisible by the number (93) formed by its first and last digit.

989958123 is a deficient number, since it is larger than the sum of its proper divisors (956322837).

989958123 is a wasteful number, since it uses less digits than its factorization.

989958123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318 (or 308 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 54.

The square root of 989958123 is about 31463.5999688529. The cubic root of 989958123 is about 996.6414403720.

The spelling of 989958123 in words is "nine hundred eighty-nine million, nine hundred fifty-eight thousand, one hundred twenty-three".