8378823949 has 4 divisors (see below), whose sum is σ = 8871695964. Its totient is φ = 7885951936.

The previous prime is 8378823931. The next prime is 8378823967. The reversal of 8378823949 is 9493288738.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9493288738 = 2 ⋅4746644369.

It is an interprime number because it is at equal distance from previous prime (8378823931) and next prime (8378823967).

It can be written as a sum of positive squares in 2 ways, for example, as 2292015625 + 6086808324 = 47875^2 + 78018^2 .

It is a cyclic number.

It is not a de Polignac number, because 8378823949 - 2⁵ = 8378823917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8378823989) by changing a digit.

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, 246435982 + ... + 246436015.

It is an arithmetic number, because the mean of its divisors is an integer number (2217923991).

Almost surely, 2^8378823949 is an apocalyptic number.

It is an amenable number.

8378823949 is a deficient number, since it is larger than the sum of its proper divisors (492872015).

8378823949 is a wasteful number, since it uses less digits than its factorization.

8378823949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492872014.

The product of its digits is 20901888, while the sum is 61.

The square root of 8378823949 is about 91535.9161695561. The cubic root of 8378823949 is about 2031.0830808617.

The spelling of 8378823949 in words is "eight billion, three hundred seventy-eight million, eight hundred twenty-three thousand, nine hundred forty-nine".