123889643 has 4 divisors (see below), whose sum is σ = 124865280. Its totient is φ = 122914008.

The previous prime is 123889637. The next prime is 123889663. The reversal of 123889643 is 346988321.

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

It is a cyclic number.

It is not a de Polignac number, because 123889643 - 2¹⁰ = 123888619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123889594 and 123889603.

It is not an unprimeable number, because it can be changed into a prime (123889663) 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 3 ways as a sum of consecutive naturals, for example, 487628 + ... + 487881.

It is an arithmetic number, because the mean of its divisors is an integer number (31216320).

Almost surely, 2^123889643 is an apocalyptic number.

123889643 is a deficient number, since it is larger than the sum of its proper divisors (975637).

123889643 is an equidigital number, since it uses as much as digits as its factorization.

123889643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 975636.

The product of its digits is 248832, while the sum is 44.

The square root of 123889643 is about 11130.5724470936. The cubic root of 123889643 is about 498.5151186199.

The spelling of 123889643 in words is "one hundred twenty-three million, eight hundred eighty-nine thousand, six hundred forty-three".