3938866777 has 2 divisors, whose sum is σ = 3938866778. Its totient is φ = 3938866776.

The previous prime is 3938866759. The next prime is 3938866823. The reversal of 3938866777 is 7776688393.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3228057856 + 710808921 = 56816^2 + 26661^2 .

It is a cyclic number.

It is not a de Polignac number, because 3938866777 - 2¹⁹ = 3938342489 is a prime.

It is a super-3 number, since 3×3938866777³ (a number of 30 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (3938866717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1969433388 + 1969433389.

It is an arithmetic number, because the mean of its divisors is an integer number (1969433389).

Almost surely, 2^3938866777 is an apocalyptic number.

It is an amenable number.

3938866777 is a deficient number, since it is larger than the sum of its proper divisors (1).

3938866777 is an equidigital number, since it uses as much as digits as its factorization.

3938866777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64012032, while the sum is 64.

The square root of 3938866777 is about 62760.3917849467. The cubic root of 3938866777 is about 1579.2725884367.

The spelling of 3938866777 in words is "three billion, nine hundred thirty-eight million, eight hundred sixty-six thousand, seven hundred seventy-seven".