3993987209 has 2 divisors, whose sum is σ = 3993987210. Its totient is φ = 3993987208.

The previous prime is 3993987119. The next prime is 3993987251. The reversal of 3993987209 is 9027893993.

3993987209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3158777209 + 835210000 = 56203^2 + 28900^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3993987209 is a prime.

It is not a weakly prime, because it can be changed into another prime (3993986209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1996993604 + 1996993605.

It is an arithmetic number, because the mean of its divisors is an integer number (1996993605).

Almost surely, 2^3993987209 is an apocalyptic number.

It is an amenable number.

3993987209 is a deficient number, since it is larger than the sum of its proper divisors (1).

3993987209 is an equidigital number, since it uses as much as digits as its factorization.

3993987209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6613488, while the sum is 59.

The square root of 3993987209 is about 63198.0000395582. Note that the first 4 decimals coincide. The cubic root of 3993987209 is about 1586.6052605277.

The spelling of 3993987209 in words is "three billion, nine hundred ninety-three million, nine hundred eighty-seven thousand, two hundred nine".