138806757 has 8 divisors (see below), whose sum is σ = 205639680. Its totient is φ = 92537820.

The previous prime is 138806753. The next prime is 138806777. The reversal of 138806757 is 757608831.

It is not a de Polignac number, because 138806757 - 2² = 138806753 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138806753) 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 7 ways as a sum of consecutive naturals, for example, 2570469 + ... + 2570522.

It is an arithmetic number, because the mean of its divisors is an integer number (25704960).

Almost surely, 2^138806757 is an apocalyptic number.

It is an amenable number.

138806757 is a deficient number, since it is larger than the sum of its proper divisors (66832923).

138806757 is an equidigital number, since it uses as much as digits as its factorization.

138806757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5141000 (or 5140994 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 45.

The square root of 138806757 is about 11781.6279435399. The cubic root of 138806757 is about 517.7699830472.

The spelling of 138806757 in words is "one hundred thirty-eight million, eight hundred six thousand, seven hundred fifty-seven".