7900396865 has 4 divisors (see below), whose sum is σ = 9480476244. Its totient is φ = 6320317488.

The previous prime is 7900396853. The next prime is 7900396877. The reversal of 7900396865 is 5686930097.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5686930097 = 71 ⋅80097607.

It is an interprime number because it is at equal distance from previous prime (7900396853) and next prime (7900396877).

It can be written as a sum of positive squares in 2 ways, for example, as 3471095056 + 4429301809 = 58916^2 + 66553^2 .

It is a cyclic number.

It is not a de Polignac number, because 7900396865 - 2¹² = 7900392769 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 790039682 + ... + 790039691.

It is an arithmetic number, because the mean of its divisors is an integer number (2370119061).

Almost surely, 2^7900396865 is an apocalyptic number.

It is an amenable number.

7900396865 is a deficient number, since it is larger than the sum of its proper divisors (1580079379).

7900396865 is a wasteful number, since it uses less digits than its factorization.

7900396865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1580079378.

The product of its (nonzero) digits is 2449440, while the sum is 53.

The square root of 7900396865 is about 88884.1766851671. The cubic root of 7900396865 is about 1991.6650513186.

The spelling of 7900396865 in words is "seven billion, nine hundred million, three hundred ninety-six thousand, eight hundred sixty-five".