3939855013 has 2 divisors, whose sum is σ = 3939855014. Its totient is φ = 3939855012.

The previous prime is 3939854981. The next prime is 3939855071. The reversal of 3939855013 is 3105589393.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3632834529 + 307020484 = 60273^2 + 17522^2 .

It is a cyclic number.

It is not a de Polignac number, because 3939855013 - 2⁵ = 3939854981 is a prime.

It is a super-2 number, since 2×3939855013² = 31044915046922460338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3939855613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1969927506 + 1969927507.

It is an arithmetic number, because the mean of its divisors is an integer number (1969927507).

Almost surely, 2^3939855013 is an apocalyptic number.

It is an amenable number.

3939855013 is a deficient number, since it is larger than the sum of its proper divisors (1).

3939855013 is an equidigital number, since it uses as much as digits as its factorization.

3939855013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 437400, while the sum is 46.

The square root of 3939855013 is about 62768.2643777889. The cubic root of 3939855013 is about 1579.4046537920.

The spelling of 3939855013 in words is "three billion, nine hundred thirty-nine million, eight hundred fifty-five thousand, thirteen".