207072309 has 4 divisors (see below), whose sum is σ = 276096416. Its totient is φ = 138048204.

The previous prime is 207072293. The next prime is 207072329. The reversal of 207072309 is 903270702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 207072309 - 2⁴ = 207072293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (207072329) 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, 34512049 + ... + 34512054.

It is an arithmetic number, because the mean of its divisors is an integer number (69024104).

Almost surely, 2^207072309 is an apocalyptic number.

It is an amenable number.

207072309 is a deficient number, since it is larger than the sum of its proper divisors (69024107).

207072309 is an equidigital number, since it uses as much as digits as its factorization.

207072309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69024106.

The product of its (nonzero) digits is 5292, while the sum is 30.

The square root of 207072309 is about 14390.0072619857. The cubic root of 207072309 is about 591.6170415916.

The spelling of 207072309 in words is "two hundred seven million, seventy-two thousand, three hundred nine".