138125247 has 16 divisors (see below), whose sum is σ = 198572640. Its totient is φ = 84897792.

The previous prime is 138125213. The next prime is 138125249. The reversal of 138125247 is 742521831.

It is not a de Polignac number, because 138125247 - 2⁸ = 138124991 is a prime.

It is a super-3 number, since 3×138125247³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138125249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42463 + ... + 45599.

It is an arithmetic number, because the mean of its divisors is an integer number (12410790).

Almost surely, 2^138125247 is an apocalyptic number.

138125247 is a deficient number, since it is larger than the sum of its proper divisors (60447393).

138125247 is a wasteful number, since it uses less digits than its factorization.

138125247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4282.

The product of its digits is 13440, while the sum is 33.

The square root of 138125247 is about 11752.6697817985. The cubic root of 138125247 is about 516.9212143325.

The spelling of 138125247 in words is "one hundred thirty-eight million, one hundred twenty-five thousand, two hundred forty-seven".