123725138 has 4 divisors (see below), whose sum is σ = 185587710. Its totient is φ = 61862568.

The previous prime is 123725113. The next prime is 123725153. The reversal of 123725138 is 831527321.

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

It can be written as a sum of positive squares in only one way, i.e., 99940009 + 23785129 = 9997^2 + 4877^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30931283 + ... + 30931286.

Almost surely, 2^123725138 is an apocalyptic number.

123725138 is a deficient number, since it is larger than the sum of its proper divisors (61862572).

123725138 is an equidigital number, since it uses as much as digits as its factorization.

123725138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61862571.

The product of its digits is 10080, while the sum is 32.

The square root of 123725138 is about 11123.1802107131. The cubic root of 123725138 is about 498.2943722841.

The spelling of 123725138 in words is "one hundred twenty-three million, seven hundred twenty-five thousand, one hundred thirty-eight".