3205987139 has 2 divisors, whose sum is σ = 3205987140. Its totient is φ = 3205987138.

The previous prime is 3205987129. The next prime is 3205987157. The reversal of 3205987139 is 9317895023.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3205987139 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3205987093 and 3205987102.

It is not a weakly prime, because it can be changed into another prime (3205987129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1602993569 + 1602993570.

It is an arithmetic number, because the mean of its divisors is an integer number (1602993570).

Almost surely, 2^3205987139 is an apocalyptic number.

3205987139 is a deficient number, since it is larger than the sum of its proper divisors (1).

3205987139 is an equidigital number, since it uses as much as digits as its factorization.

3205987139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 408240, while the sum is 47.

The square root of 3205987139 is about 56621.4370976223. The cubic root of 3205987139 is about 1474.5310605806.

The spelling of 3205987139 in words is "three billion, two hundred five million, nine hundred eighty-seven thousand, one hundred thirty-nine".