138357761 has 4 divisors (see below), whose sum is σ = 138466224. Its totient is φ = 138249300.

The previous prime is 138357721. The next prime is 138357787. The reversal of 138357761 is 167753831.

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 138357761 - 2⁶ = 138357697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138357721) 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, 52295 + ... + 54876.

It is an arithmetic number, because the mean of its divisors is an integer number (34616556).

Almost surely, 2^138357761 is an apocalyptic number.

It is an amenable number.

138357761 is a deficient number, since it is larger than the sum of its proper divisors (108463).

138357761 is a wasteful number, since it uses less digits than its factorization.

138357761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108462.

The product of its digits is 105840, while the sum is 41.

The square root of 138357761 is about 11762.5575875317. The cubic root of 138357761 is about 517.2111059180.

The spelling of 138357761 in words is "one hundred thirty-eight million, three hundred fifty-seven thousand, seven hundred sixty-one".