123939889693 has 8 divisors (see below), whose sum is σ = 124767154688. Its totient is φ = 123113103984.

The previous prime is 123939889687. The next prime is 123939889709. The reversal of 123939889693 is 396988939321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123939889693 is a prime.

It is a super-2 number, since 2×123939889693² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123939889603) 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 7 ways as a sum of consecutive naturals, for example, 406780 + ... + 642922.

It is an arithmetic number, because the mean of its divisors is an integer number (15595894336).

Almost surely, 2^123939889693 is an apocalyptic number.

It is an amenable number.

123939889693 is a deficient number, since it is larger than the sum of its proper divisors (827264995).

123939889693 is a wasteful number, since it uses less digits than its factorization.

123939889693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239643.

The product of its digits is 136048896, while the sum is 70.

The spelling of 123939889693 in words is "one hundred twenty-three billion, nine hundred thirty-nine million, eight hundred eighty-nine thousand, six hundred ninety-three".