3878424721 has 2 divisors, whose sum is σ = 3878424722. Its totient is φ = 3878424720.

The previous prime is 3878424701. The next prime is 3878424731. The reversal of 3878424721 is 1274248783.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3391781121 + 486643600 = 58239^2 + 22060^2 .

It is a cyclic number.

It is not a de Polignac number, because 3878424721 - 2¹⁵ = 3878391953 is a prime.

It is not a weakly prime, because it can be changed into another prime (3878424701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1939212360 + 1939212361.

It is an arithmetic number, because the mean of its divisors is an integer number (1939212361).

Almost surely, 2^3878424721 is an apocalyptic number.

It is an amenable number.

3878424721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3878424721 is an equidigital number, since it uses as much as digits as its factorization.

3878424721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 602112, while the sum is 46.

The square root of 3878424721 is about 62276.9999357708. Note that the first 4 decimals coincide. The cubic root of 3878424721 is about 1571.1529147737.

The spelling of 3878424721 in words is "three billion, eight hundred seventy-eight million, four hundred twenty-four thousand, seven hundred twenty-one".