138481733 has 8 divisors (see below), whose sum is σ = 149756376. Its totient is φ = 127296000.

The previous prime is 138481727. The next prime is 138481753. The reversal of 138481733 is 337184831.

It can be written as a sum of positive squares in 4 ways, for example, as 2829124 + 135652609 = 1682^2 + 11647^2 .

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

It is not a de Polignac number, because 138481733 - 2²⁶ = 71372869 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 (138481753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18968 + ... + 25233.

It is an arithmetic number, because the mean of its divisors is an integer number (18719547).

Almost surely, 2^138481733 is an apocalyptic number.

138481733 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

138481733 is a deficient number, since it is larger than the sum of its proper divisors (11274643).

138481733 is a wasteful number, since it uses less digits than its factorization.

138481733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44455.

The product of its digits is 48384, while the sum is 38.

The square root of 138481733 is about 11767.8261798856. The cubic root of 138481733 is about 517.3655378134.

The spelling of 138481733 in words is "one hundred thirty-eight million, four hundred eighty-one thousand, seven hundred thirty-three".