138588761 has 4 divisors (see below), whose sum is σ = 138627024. Its totient is φ = 138550500.

The previous prime is 138588757. The next prime is 138588803. The reversal of 138588761 is 167885831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138588761 - 2² = 138588757 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138588701) 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 3 ways as a sum of consecutive naturals, for example, 13055 + ... + 21156.

It is an arithmetic number, because the mean of its divisors is an integer number (34656756).

Almost surely, 2^138588761 is an apocalyptic number.

It is an amenable number.

138588761 is a deficient number, since it is larger than the sum of its proper divisors (38263).

138588761 is an equidigital number, since it uses as much as digits as its factorization.

138588761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38262.

The product of its digits is 322560, while the sum is 47.

The square root of 138588761 is about 11772.3727854668. The cubic root of 138588761 is about 517.4987884559.

The spelling of 138588761 in words is "one hundred thirty-eight million, five hundred eighty-eight thousand, seven hundred sixty-one".