138995285 has 32 divisors (see below), whose sum is σ = 198713088. Its totient is φ = 91998720.

The previous prime is 138995257. The next prime is 138995287. The reversal of 138995285 is 582599831.

It is a de Polignac number, because none of the positive numbers 2^k-138995285 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 (138995287) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50864 + ... + 53526.

It is an arithmetic number, because the mean of its divisors is an integer number (6209784).

Almost surely, 2^138995285 is an apocalyptic number.

It is an amenable number.

138995285 is a deficient number, since it is larger than the sum of its proper divisors (59717803).

138995285 is a wasteful number, since it uses less digits than its factorization.

138995285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2765.

The product of its digits is 777600, while the sum is 50.

The square root of 138995285 is about 11789.6261603157. The cubic root of 138995285 is about 518.0042895547.

The spelling of 138995285 in words is "one hundred thirty-eight million, nine hundred ninety-five thousand, two hundred eighty-five".