123256839 has 8 divisors (see below), whose sum is σ = 171487872. Its totient is φ = 78598520.

The previous prime is 123256807. The next prime is 123256843. The reversal of 123256839 is 938652321.

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 123256839 - 2⁵ = 123256807 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123256797 and 123256806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123256849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 893097 + ... + 893234.

It is an arithmetic number, because the mean of its divisors is an integer number (21435984).

Almost surely, 2^123256839 is an apocalyptic number.

123256839 is a deficient number, since it is larger than the sum of its proper divisors (48231033).

123256839 is a wasteful number, since it uses less digits than its factorization.

123256839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1786357.

The product of its digits is 77760, while the sum is 39.

The square root of 123256839 is about 11102.1096643836. The cubic root of 123256839 is about 497.6648968972.

The spelling of 123256839 in words is "one hundred twenty-three million, two hundred fifty-six thousand, eight hundred thirty-nine".