139042123 has 4 divisors (see below), whose sum is σ = 151682328. Its totient is φ = 126401920.

The previous prime is 139042109. The next prime is 139042129. The reversal of 139042123 is 321240931.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 139042123 - 2⁹ = 139041611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139042129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6320086 + ... + 6320107.

It is an arithmetic number, because the mean of its divisors is an integer number (37920582).

Almost surely, 2^139042123 is an apocalyptic number.

139042123 is a deficient number, since it is larger than the sum of its proper divisors (12640205).

139042123 is a wasteful number, since it uses less digits than its factorization.

139042123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12640204.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 139042123 is about 11791.6124003463. The cubic root of 139042123 is about 518.0624679314.

The spelling of 139042123 in words is "one hundred thirty-nine million, forty-two thousand, one hundred twenty-three".