138886257 has 8 divisors (see below), whose sum is σ = 194928160. Its totient is φ = 87717600.

The previous prime is 138886207. The next prime is 138886261. The reversal of 138886257 is 752688831.

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

It is not a de Polignac number, because 138886257 - 2¹⁸ = 138624113 is a prime.

It is a super-3 number, since 3×138886257³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138886207) 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 7 ways as a sum of consecutive naturals, for example, 1218244 + ... + 1218357.

It is an arithmetic number, because the mean of its divisors is an integer number (24366020).

Almost surely, 2^138886257 is an apocalyptic number.

It is an amenable number.

138886257 is a deficient number, since it is larger than the sum of its proper divisors (56041903).

138886257 is a wasteful number, since it uses less digits than its factorization.

138886257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2436623.

The product of its digits is 645120, while the sum is 48.

The square root of 138886257 is about 11785.0013576580. The cubic root of 138886257 is about 517.8688131487.

The spelling of 138886257 in words is "one hundred thirty-eight million, eight hundred eighty-six thousand, two hundred fifty-seven".