138500385 has 16 divisors (see below), whose sum is σ = 221844480. Its totient is φ = 73785600.

The previous prime is 138500381. The next prime is 138500387. The reversal of 138500385 is 583005831.

It is not a de Polignac number, because 138500385 - 2² = 138500381 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138500381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10560 + ... + 19710.

It is an arithmetic number, because the mean of its divisors is an integer number (13865280).

Almost surely, 2^138500385 is an apocalyptic number.

138500385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138500385 is a deficient number, since it is larger than the sum of its proper divisors (83344095).

138500385 is a wasteful number, since it uses less digits than its factorization.

138500385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10168.

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 138500385 is about 11768.6186530111. The cubic root of 138500385 is about 517.3887646284.

The spelling of 138500385 in words is "one hundred thirty-eight million, five hundred thousand, three hundred eighty-five".