139124123 has 4 divisors (see below), whose sum is σ = 139665720. Its totient is φ = 138582528.

The previous prime is 139124087. The next prime is 139124129. The reversal of 139124123 is 321421931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321421931 = 991 ⋅324341.

It is a cyclic number.

It is not a de Polignac number, because 139124123 - 2⁶ = 139124059 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 139124092 and 139124101.

It is not an unprimeable number, because it can be changed into a prime (139124129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 270413 + ... + 270926.

It is an arithmetic number, because the mean of its divisors is an integer number (34916430).

Almost surely, 2^139124123 is an apocalyptic number.

139124123 is a deficient number, since it is larger than the sum of its proper divisors (541597).

139124123 is an equidigital number, since it uses as much as digits as its factorization.

139124123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541596.

The product of its digits is 1296, while the sum is 26.

The square root of 139124123 is about 11795.0889356545. The cubic root of 139124123 is about 518.1642902500.

The spelling of 139124123 in words is "one hundred thirty-nine million, one hundred twenty-four thousand, one hundred twenty-three".