138749757 has 8 divisors (see below), whose sum is σ = 185149440. Its totient is φ = 92424960.

The previous prime is 138749753. The next prime is 138749759. The reversal of 138749757 is 757947831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 138749757 - 2² = 138749753 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138749753) 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, 14244 + ... + 21917.

It is an arithmetic number, because the mean of its divisors is an integer number (23143680).

Almost surely, 2^138749757 is an apocalyptic number.

It is an amenable number.

138749757 is a deficient number, since it is larger than the sum of its proper divisors (46399683).

138749757 is a wasteful number, since it uses less digits than its factorization.

138749757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37443.

The product of its digits is 1481760, while the sum is 51.

The square root of 138749757 is about 11779.2086746097. The cubic root of 138749757 is about 517.6991004995.

The spelling of 138749757 in words is "one hundred thirty-eight million, seven hundred forty-nine thousand, seven hundred fifty-seven".