1306072209 has 24 divisors (see below), whose sum is σ = 1992208960. Its totient is φ = 756451584.

The previous prime is 1306072199. The next prime is 1306072211. The reversal of 1306072209 is 9022706031.

It is not a de Polignac number, because 1306072209 - 2⁷ = 1306072081 is a prime.

It is a super-3 number, since 3×1306072209³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1306072409) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46669 + ... + 69210.

Almost surely, 2^1306072209 is an apocalyptic number.

It is an amenable number.

1306072209 is a deficient number, since it is larger than the sum of its proper divisors (686136751).

1306072209 is a wasteful number, since it uses less digits than its factorization.

1306072209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115929 (or 115912 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 1306072209 is about 36139.6210411786. The cubic root of 1306072209 is about 1093.0895174296.

The spelling of 1306072209 in words is "one billion, three hundred six million, seventy-two thousand, two hundred nine".