8390193605 has 4 divisors (see below), whose sum is σ = 10068232332. Its totient is φ = 6712154880.

The previous prime is 8390193533. The next prime is 8390193619. The reversal of 8390193605 is 5063910938.

It is a Cunningham number, because it is equal to 91598²+1.

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 3020381764 + 5369811841 = 54958^2 + 73279^2 .

It is not a de Polignac number, because 8390193605 - 2⁸ = 8390193349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 839019356 + ... + 839019365.

It is an arithmetic number, because the mean of its divisors is an integer number (2517058083).

Almost surely, 2^8390193605 is an apocalyptic number.

It is an amenable number.

8390193605 is a deficient number, since it is larger than the sum of its proper divisors (1678038727).

8390193605 is a wasteful number, since it uses less digits than its factorization.

8390193605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1678038726.

The product of its (nonzero) digits is 174960, while the sum is 44.

The square root of 8390193605 is about 91598.0000054586. Note that the first 5 decimals coincide. The cubic root of 8390193605 is about 2032.0013592388.

The spelling of 8390193605 in words is "eight billion, three hundred ninety million, one hundred ninety-three thousand, six hundred five".