3939984557 has 4 divisors (see below), whose sum is σ = 3940341600. Its totient is φ = 3939627516.

The previous prime is 3939984539. The next prime is 3939984577. The reversal of 3939984557 is 7554899393.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 3939984557 - 2²⁴ = 3923207341 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3939984557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3939984527) 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, 161423 + ... + 184220.

It is an arithmetic number, because the mean of its divisors is an integer number (985085400).

Almost surely, 2^3939984557 is an apocalyptic number.

It is an amenable number.

3939984557 is a deficient number, since it is larger than the sum of its proper divisors (357043).

3939984557 is a wasteful number, since it uses less digits than its factorization.

3939984557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357042.

The product of its digits is 36741600, while the sum is 62.

The square root of 3939984557 is about 62769.2962920567. The cubic root of 3939984557 is about 1579.4219640867.

The spelling of 3939984557 in words is "three billion, nine hundred thirty-nine million, nine hundred eighty-four thousand, five hundred fifty-seven".