123172839 has 24 divisors (see below), whose sum is σ = 192603120. Its totient is φ = 77787216.

The previous prime is 123172817. The next prime is 123172873. The reversal of 123172839 is 938271321.

It is not a de Polignac number, because 123172839 - 2⁵ = 123172807 is a prime.

It is a super-3 number, since 3×123172839³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123172039) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3429 + ... + 16065.

It is an arithmetic number, because the mean of its divisors is an integer number (8025130).

Almost surely, 2^123172839 is an apocalyptic number.

123172839 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

123172839 is a deficient number, since it is larger than the sum of its proper divisors (69430281).

123172839 is a wasteful number, since it uses less digits than its factorization.

123172839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12684 (or 12659 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 123172839 is about 11098.3259548456. The cubic root of 123172839 is about 497.5518177048.

The spelling of 123172839 in words is "one hundred twenty-three million, one hundred seventy-two thousand, eight hundred thirty-nine".