3988421779 has 2 divisors, whose sum is σ = 3988421780. Its totient is φ = 3988421778.

The previous prime is 3988421747. The next prime is 3988421819. The reversal of 3988421779 is 9771248893.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3988421779 - 2⁵ = 3988421747 is a prime.

It is not a weakly prime, because it can be changed into another prime (3988491779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1994210889 + 1994210890.

It is an arithmetic number, because the mean of its divisors is an integer number (1994210890).

Almost surely, 2^3988421779 is an apocalyptic number.

3988421779 is a deficient number, since it is larger than the sum of its proper divisors (1).

3988421779 is an equidigital number, since it uses as much as digits as its factorization.

3988421779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6096384, while the sum is 58.

The square root of 3988421779 is about 63153.9529958339. The cubic root of 3988421779 is about 1585.8679651309.

The spelling of 3988421779 in words is "three billion, nine hundred eighty-eight million, four hundred twenty-one thousand, seven hundred seventy-nine".