123989927 has 4 divisors (see below), whose sum is σ = 125736336. Its totient is φ = 122243520.

The previous prime is 123989917. The next prime is 123989933. The reversal of 123989927 is 729989321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 729989321 = 67 ⋅10895363.

It is a cyclic number.

It is not a de Polignac number, because 123989927 - 2¹⁰ = 123988903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123989917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 873098 + ... + 873239.

It is an arithmetic number, because the mean of its divisors is an integer number (31434084).

Almost surely, 2^123989927 is an apocalyptic number.

123989927 is a deficient number, since it is larger than the sum of its proper divisors (1746409).

123989927 is an equidigital number, since it uses as much as digits as its factorization.

123989927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1746408.

The product of its digits is 489888, while the sum is 50.

The square root of 123989927 is about 11135.0764254225. The cubic root of 123989927 is about 498.6495920804.

The spelling of 123989927 in words is "one hundred twenty-three million, nine hundred eighty-nine thousand, nine hundred twenty-seven".