3939988557 has 4 divisors (see below), whose sum is σ = 5253318080. Its totient is φ = 2626659036.

The previous prime is 3939988537. The next prime is 3939988589. The reversal of 3939988557 is 7558899393.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 3939988557 - 2²⁰ = 3938939981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3939988537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 656664757 + ... + 656664762.

It is an arithmetic number, because the mean of its divisors is an integer number (1313329520).

Almost surely, 2^3939988557 is an apocalyptic number.

It is an amenable number.

3939988557 is a deficient number, since it is larger than the sum of its proper divisors (1313329523).

3939988557 is a wasteful number, since it uses less digits than its factorization.

3939988557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1313329522.

The product of its digits is 73483200, while the sum is 66.

The square root of 3939988557 is about 62769.3281547604. The cubic root of 3939988557 is about 1579.4224985800.

The spelling of 3939988557 in words is "three billion, nine hundred thirty-nine million, nine hundred eighty-eight thousand, five hundred fifty-seven".