123939289 has 4 divisors (see below), whose sum is σ = 124067124. Its totient is φ = 123811456.

The previous prime is 123939259. The next prime is 123939317. The reversal of 123939289 is 982939321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 120824064 + 3115225 = 10992^2 + 1765^2 .

It is a cyclic number.

It is not a de Polignac number, because 123939289 - 2⁷ = 123939161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123939239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62452 + ... + 64405.

It is an arithmetic number, because the mean of its divisors is an integer number (31016781).

Almost surely, 2^123939289 is an apocalyptic number.

It is an amenable number.

123939289 is a deficient number, since it is larger than the sum of its proper divisors (127835).

123939289 is an equidigital number, since it uses as much as digits as its factorization.

123939289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127834.

The product of its digits is 209952, while the sum is 46.

The square root of 123939289 is about 11132.8023875393. The cubic root of 123939289 is about 498.5816993170.

The spelling of 123939289 in words is "one hundred twenty-three million, nine hundred thirty-nine thousand, two hundred eighty-nine".