123278559 has 8 divisors (see below), whose sum is σ = 164452272. Its totient is φ = 82145280.

The previous prime is 123278539. The next prime is 123278563. The reversal of 123278559 is 955872321.

It is a happy number.

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

It is not a de Polignac number, because 123278559 - 2⁸ = 123278303 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123278559.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123278539) 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, 2082 + ... + 15839.

It is an arithmetic number, because the mean of its divisors is an integer number (20556534).

Almost surely, 2^123278559 is an apocalyptic number.

123278559 is a deficient number, since it is larger than the sum of its proper divisors (41173713).

123278559 is a wasteful number, since it uses less digits than its factorization.

123278559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20217.

The product of its digits is 151200, while the sum is 42.

The square root of 123278559 is about 11103.0878137570. The cubic root of 123278559 is about 497.6941275854.

The spelling of 123278559 in words is "one hundred twenty-three million, two hundred seventy-eight thousand, five hundred fifty-nine".