138501507 has 8 divisors (see below), whose sum is σ = 194388160. Its totient is φ = 87474600.

The previous prime is 138501487. The next prime is 138501523. The reversal of 138501507 is 705105831.

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

It is a de Polignac number, because none of the positive numbers 2^k-138501507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138501577) 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, 1214869 + ... + 1214982.

It is an arithmetic number, because the mean of its divisors is an integer number (24298520).

Almost surely, 2^138501507 is an apocalyptic number.

138501507 is a deficient number, since it is larger than the sum of its proper divisors (55886653).

138501507 is a wasteful number, since it uses less digits than its factorization.

138501507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2429873.

The product of its (nonzero) digits is 4200, while the sum is 30.

The square root of 138501507 is about 11768.6663220605. Note that the first 3 decimals coincide. The cubic root of 138501507 is about 517.3901617572.

The spelling of 138501507 in words is "one hundred thirty-eight million, five hundred one thousand, five hundred seven".