138137507 has 4 divisors (see below), whose sum is σ = 138205056. Its totient is φ = 138069960.

The previous prime is 138137501. The next prime is 138137509. The reversal of 138137507 is 705731831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138137507 - 2⁴ = 138137491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138137501) 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, 30608 + ... + 34829.

It is an arithmetic number, because the mean of its divisors is an integer number (34551264).

Almost surely, 2^138137507 is an apocalyptic number.

138137507 is a deficient number, since it is larger than the sum of its proper divisors (67549).

138137507 is an equidigital number, since it uses as much as digits as its factorization.

138137507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67548.

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 138137507 is about 11753.1913538409. The cubic root of 138137507 is about 516.9365078595.

The spelling of 138137507 in words is "one hundred thirty-eight million, one hundred thirty-seven thousand, five hundred seven".