138533761 has 16 divisors (see below), whose sum is σ = 149925888. Its totient is φ = 127630800.

The previous prime is 138533741. The next prime is 138533771. The reversal of 138533761 is 167335831.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 138533761 - 2¹⁷ = 138402689 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138533761.

It is not an unprimeable number, because it can be changed into a prime (138533701) 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, 235710 + ... + 236296.

It is an arithmetic number, because the mean of its divisors is an integer number (9370368).

Almost surely, 2^138533761 is an apocalyptic number.

It is an amenable number.

138533761 is a deficient number, since it is larger than the sum of its proper divisors (11392127).

138533761 is a wasteful number, since it uses less digits than its factorization.

138533761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972.

The product of its digits is 45360, while the sum is 37.

The square root of 138533761 is about 11770.0365759840. The cubic root of 138533761 is about 517.4303216260.

The spelling of 138533761 in words is "one hundred thirty-eight million, five hundred thirty-three thousand, seven hundred sixty-one".