3993987205 has 8 divisors (see below), whose sum is σ = 5161460472. Its totient is φ = 2949405888.

The previous prime is 3993987119. The next prime is 3993987209. The reversal of 3993987205 is 5027893993.

3993987205 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 63198²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 3993987204 = 1^2 + 63198^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-3993987205 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 (3993987209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30722914 + ... + 30723043.

It is an arithmetic number, because the mean of its divisors is an integer number (645182559).

Almost surely, 2^3993987205 is an apocalyptic number.

It is an amenable number.

3993987205 is a deficient number, since it is larger than the sum of its proper divisors (1167473267).

3993987205 is a wasteful number, since it uses less digits than its factorization.

3993987205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61445975.

The product of its (nonzero) digits is 3674160, while the sum is 55.

The square root of 3993987205 is about 63198.0000079116. Note that the first 5 decimals coincide. The cubic root of 3993987205 is about 1586.6052599980.

The spelling of 3993987205 in words is "three billion, nine hundred ninety-three million, nine hundred eighty-seven thousand, two hundred five".