207873009 has 6 divisors (see below), whose sum is σ = 300261026. Its totient is φ = 138582000.

The previous prime is 207873007. The next prime is 207873013. The reversal of 207873009 is 900378702.

It can be written as a sum of positive squares in only one way, i.e., 206928225 + 944784 = 14385^2 + 972^2 .

It is not a de Polignac number, because 207873009 - 2¹ = 207873007 is a prime.

It is a super-2 number, since 2×207873009² = 86422375741428162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (207873007) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11548492 + ... + 11548509.

Almost surely, 2^207873009 is an apocalyptic number.

It is an amenable number.

207873009 is a deficient number, since it is larger than the sum of its proper divisors (92388017).

207873009 is a wasteful number, since it uses less digits than its factorization.

207873009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23097007 (or 23097004 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 207873009 is about 14417.8018088750. The cubic root of 207873009 is about 592.3786088971.

The spelling of 207873009 in words is "two hundred seven million, eight hundred seventy-three thousand, nine".