3939854981 has 2 divisors, whose sum is σ = 3939854982. Its totient is φ = 3939854980.

The previous prime is 3939854929. The next prime is 3939855013. The reversal of 3939854981 is 1894589393.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2280922081 + 1658932900 = 47759^2 + 40730^2 .

It is an emirp because it is prime and its reverse (1894589393) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3939854981 - 2¹⁴ = 3939838597 is a prime.

It is a super-2 number, since 2×3939854981² = 31044914542621020722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3939854981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3939854911) 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, 1969927490 + 1969927491.

It is an arithmetic number, because the mean of its divisors is an integer number (1969927491).

Almost surely, 2^3939854981 is an apocalyptic number.

It is an amenable number.

3939854981 is a deficient number, since it is larger than the sum of its proper divisors (1).

3939854981 is an equidigital number, since it uses as much as digits as its factorization.

3939854981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8398080, while the sum is 59.

The square root of 3939854981 is about 62768.2641228830. The cubic root of 3939854981 is about 1579.4046495160.

The spelling of 3939854981 in words is "three billion, nine hundred thirty-nine million, eight hundred fifty-four thousand, nine hundred eighty-one".