123989879 has 4 divisors (see below), whose sum is σ = 133527576. Its totient is φ = 114452184.

The previous prime is 123989869. The next prime is 123989917. The reversal of 123989879 is 978989321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 978989321 = 6067 ⋅161363.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123989879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123989809) 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, 4768829 + ... + 4768854.

It is an arithmetic number, because the mean of its divisors is an integer number (33381894).

Almost surely, 2^123989879 is an apocalyptic number.

123989879 is a deficient number, since it is larger than the sum of its proper divisors (9537697).

123989879 is an equidigital number, since it uses as much as digits as its factorization.

123989879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9537696.

The product of its digits is 1959552, while the sum is 56.

The square root of 123989879 is about 11135.0742700711. The cubic root of 123989879 is about 498.6495277333.

The spelling of 123989879 in words is "one hundred twenty-three million, nine hundred eighty-nine thousand, eight hundred seventy-nine".