123456678889 has 8 divisors (see below), whose sum is σ = 126855975168. Its totient is φ = 120060678960.

The previous prime is 123456678887. The next prime is 123456678907. The reversal of 123456678889 is 988876654321.

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

It is a cyclic number.

It is not a de Polignac number, because 123456678889 - 2¹ = 123456678887 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (123456678883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 748057 + ... + 898054.

It is an arithmetic number, because the mean of its divisors is an integer number (15856996896).

Almost surely, 2^123456678889 is an apocalyptic number.

It is an amenable number.

123456678889 is a deficient number, since it is larger than the sum of its proper divisors (3399296279).

123456678889 is a wasteful number, since it uses less digits than its factorization.

123456678889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1648175.

The product of its digits is 139345920, while the sum is 67.

The spelling of 123456678889 in words is "one hundred twenty-three billion, four hundred fifty-six million, six hundred seventy-eight thousand, eight hundred eighty-nine".