207138139 has 4 divisors (see below), whose sum is σ = 223071856. Its totient is φ = 191204424.

The previous prime is 207138121. The next prime is 207138179. The reversal of 207138139 is 931831702.

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 207138139 - 2¹³ = 207129947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (207138179) 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, 7966839 + ... + 7966864.

It is an arithmetic number, because the mean of its divisors is an integer number (55767964).

Almost surely, 2^207138139 is an apocalyptic number.

207138139 is a deficient number, since it is larger than the sum of its proper divisors (15933717).

207138139 is a wasteful number, since it uses less digits than its factorization.

207138139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15933716.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 207138139 is about 14392.2944313963. The cubic root of 207138139 is about 591.6797282664.

The spelling of 207138139 in words is "two hundred seven million, one hundred thirty-eight thousand, one hundred thirty-nine".