138833731 has 8 divisors (see below), whose sum is σ = 144393920. Its totient is φ = 133368768.

The previous prime is 138833699. The next prime is 138833767. The reversal of 138833731 is 137338831.

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 138833731 - 2⁵ = 138833699 is a prime.

It is a super-2 number, since 2×138833731² = 38549609726760722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138833771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20826 + ... + 26671.

It is an arithmetic number, because the mean of its divisors is an integer number (18049240).

Almost surely, 2^138833731 is an apocalyptic number.

138833731 is a deficient number, since it is larger than the sum of its proper divisors (5560189).

138833731 is an equidigital number, since it uses as much as digits as its factorization.

138833731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47613.

The product of its digits is 36288, while the sum is 37.

The square root of 138833731 is about 11782.7726363535. The cubic root of 138833731 is about 517.8035198942.

The spelling of 138833731 in words is "one hundred thirty-eight million, eight hundred thirty-three thousand, seven hundred thirty-one".