123607989 has 24 divisors (see below), whose sum is σ = 183549912. Its totient is φ = 80110080.

The previous prime is 123607987. The next prime is 123608027. The reversal of 123607989 is 989706321.

It can be written as a sum of positive squares in 4 ways, for example, as 43362225 + 80245764 = 6585^2 + 8958^2 .

It is not a de Polignac number, because 123607989 - 2¹ = 123607987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123607987) 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 23 ways as a sum of consecutive naturals, for example, 168267 + ... + 168999.

It is an arithmetic number, because the mean of its divisors is an integer number (7647913).

Almost surely, 2^123607989 is an apocalyptic number.

It is an amenable number.

123607989 is a deficient number, since it is larger than the sum of its proper divisors (59941923).

123607989 is a wasteful number, since it uses less digits than its factorization.

123607989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1237 (or 1234 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 123607989 is about 11117.9129786125. The cubic root of 123607989 is about 498.1370528095.

The spelling of 123607989 in words is "one hundred twenty-three million, six hundred seven thousand, nine hundred eighty-nine".