123523139 has 4 divisors (see below), whose sum is σ = 130789224. Its totient is φ = 116257056.

The previous prime is 123523129. The next prime is 123523163. The reversal of 123523139 is 931325321.

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 123523139 - 2¹² = 123519043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123523129) 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, 3633017 + ... + 3633050.

It is an arithmetic number, because the mean of its divisors is an integer number (32697306).

Almost surely, 2^123523139 is an apocalyptic number.

123523139 is a deficient number, since it is larger than the sum of its proper divisors (7266085).

123523139 is an equidigital number, since it uses as much as digits as its factorization.

123523139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7266084.

The product of its digits is 4860, while the sum is 29.

The square root of 123523139 is about 11114.0964095153. The cubic root of 123523139 is about 498.0230456048.

The spelling of 123523139 in words is "one hundred twenty-three million, five hundred twenty-three thousand, one hundred thirty-nine".