138815833 has 16 divisors (see below), whose sum is σ = 156844800. Its totient is φ = 121898304.

The previous prime is 138815777. The next prime is 138815857. The reversal of 138815833 is 338518831.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138815833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138815233) 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 15 ways as a sum of consecutive naturals, for example, 58335 + ... + 60667.

It is an arithmetic number, because the mean of its divisors is an integer number (9802800).

Almost surely, 2^138815833 is an apocalyptic number.

138815833 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

138815833 is a deficient number, since it is larger than the sum of its proper divisors (18028967).

138815833 is a wasteful number, since it uses less digits than its factorization.

138815833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2568.

The product of its digits is 69120, while the sum is 40.

The square root of 138815833 is about 11782.0131132163. The cubic root of 138815833 is about 517.7812677475.

The spelling of 138815833 in words is "one hundred thirty-eight million, eight hundred fifteen thousand, eight hundred thirty-three".