8388478949 has 2 divisors, whose sum is σ = 8388478950. Its totient is φ = 8388478948.

The previous prime is 8388478937. The next prime is 8388478979. The reversal of 8388478949 is 9498748838.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7481385025 + 907093924 = 86495^2 + 30118^2 .

It is a cyclic number.

It is not a de Polignac number, because 8388478949 - 2¹⁶ = 8388413413 is a prime.

It is a super-2 number, since 2×8388478949² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8388478979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4194239474 + 4194239475.

It is an arithmetic number, because the mean of its divisors is an integer number (4194239475).

Almost surely, 2^8388478949 is an apocalyptic number.

It is an amenable number.

8388478949 is a deficient number, since it is larger than the sum of its proper divisors (1).

8388478949 is an equidigital number, since it uses as much as digits as its factorization.

8388478949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 111476736, while the sum is 68.

The square root of 8388478949 is about 91588.6398468718. The cubic root of 8388478949 is about 2031.8629269665.

The spelling of 8388478949 in words is "eight billion, three hundred eighty-eight million, four hundred seventy-eight thousand, nine hundred forty-nine".