4006505387 has 2 divisors, whose sum is σ = 4006505388. Its totient is φ = 4006505386.

The previous prime is 4006505381. The next prime is 4006505417. The reversal of 4006505387 is 7835056004.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4006505387 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4006505387.

It is not a weakly prime, because it can be changed into another prime (4006505381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2003252693 + 2003252694.

It is an arithmetic number, because the mean of its divisors is an integer number (2003252694).

Almost surely, 2^4006505387 is an apocalyptic number.

4006505387 is a deficient number, since it is larger than the sum of its proper divisors (1).

4006505387 is an equidigital number, since it uses as much as digits as its factorization.

4006505387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100800, while the sum is 38.

The square root of 4006505387 is about 63296.9619097157. The cubic root of 4006505387 is about 1588.2611407163.

The spelling of 4006505387 in words is "four billion, six million, five hundred five thousand, three hundred eighty-seven".