138539527 has 8 divisors (see below), whose sum is σ = 163438592. Its totient is φ = 114917400.

The previous prime is 138539521. The next prime is 138539539. The reversal of 138539527 is 725935831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138539527 - 2³ = 138539519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138539521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318999 + ... + 319432.

It is an arithmetic number, because the mean of its divisors is an integer number (20429824).

Almost surely, 2^138539527 is an apocalyptic number.

138539527 is a deficient number, since it is larger than the sum of its proper divisors (24899065).

138539527 is an equidigital number, since it uses as much as digits as its factorization.

138539527 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638469.

The product of its digits is 226800, while the sum is 43.

The square root of 138539527 is about 11770.2815174489. The cubic root of 138539527 is about 517.4375002897.

The spelling of 138539527 in words is "one hundred thirty-eight million, five hundred thirty-nine thousand, five hundred twenty-seven".