8390680909 has 4 divisors (see below), whose sum is σ = 9036117916. Its totient is φ = 7745243904.

The previous prime is 8390680901. The next prime is 8390680919. The reversal of 8390680909 is 9090860938.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1849430025 + 6541250884 = 43005^2 + 80878^2 .

It is a cyclic number.

It is not a de Polignac number, because 8390680909 - 2³ = 8390680901 is a prime.

It is a super-2 number, since 2×8390680909² (a number of 21 digits) contains 22 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 (8390680901) 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, 322718484 + ... + 322718509.

It is an arithmetic number, because the mean of its divisors is an integer number (2259029479).

Almost surely, 2^8390680909 is an apocalyptic number.

It is an amenable number.

8390680909 is a deficient number, since it is larger than the sum of its proper divisors (645437007).

8390680909 is a wasteful number, since it uses less digits than its factorization.

8390680909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645437006.

The product of its (nonzero) digits is 839808, while the sum is 52.

The square root of 8390680909 is about 91600.6599812469. The cubic root of 8390680909 is about 2032.0406981491.

The spelling of 8390680909 in words is "eight billion, three hundred ninety million, six hundred eighty thousand, nine hundred nine".