138538707 has 4 divisors (see below), whose sum is σ = 184718280. Its totient is φ = 92359136.

The previous prime is 138538663. The next prime is 138538759. The reversal of 138538707 is 707835831.

138538707 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 707835831 = 3 ⋅235945277.

It is a cyclic number.

It is not a de Polignac number, because 138538707 - 2¹² = 138534611 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138538007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23089782 + ... + 23089787.

It is an arithmetic number, because the mean of its divisors is an integer number (46179570).

Almost surely, 2^138538707 is an apocalyptic number.

138538707 is a deficient number, since it is larger than the sum of its proper divisors (46179573).

138538707 is an equidigital number, since it uses as much as digits as its factorization.

138538707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46179572.

The product of its (nonzero) digits is 141120, while the sum is 42.

The square root of 138538707 is about 11770.2466839060. The cubic root of 138538707 is about 517.4364794027.

The spelling of 138538707 in words is "one hundred thirty-eight million, five hundred thirty-eight thousand, seven hundred seven".