138831249 has 8 divisors (see below), whose sum is σ = 185522400. Its totient is φ = 92347136.

The previous prime is 138831247. The next prime is 138831263. The reversal of 138831249 is 942138831.

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 138831249 - 2¹ = 138831247 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (138831247) 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, 50187 + ... + 52880.

It is an arithmetic number, because the mean of its divisors is an integer number (23190300).

Almost surely, 2^138831249 is an apocalyptic number.

It is an amenable number.

138831249 is a deficient number, since it is larger than the sum of its proper divisors (46691151).

138831249 is a wasteful number, since it uses less digits than its factorization.

138831249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103519.

The product of its digits is 41472, while the sum is 39.

The square root of 138831249 is about 11782.6673126249. The cubic root of 138831249 is about 517.8004341984.

The spelling of 138831249 in words is "one hundred thirty-eight million, eight hundred thirty-one thousand, two hundred forty-nine".