3985855247 has 16 divisors (see below), whose sum is σ = 4373394432. Its totient is φ = 3602581920.

The previous prime is 3985855243. The next prime is 3985855267. The reversal of 3985855247 is 7425585893.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 3985855247 - 2² = 3985855243 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3985855192 and 3985855201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3985855243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1504478 + ... + 1507124.

It is an arithmetic number, because the mean of its divisors is an integer number (273337152).

Almost surely, 2^3985855247 is an apocalyptic number.

3985855247 is a deficient number, since it is larger than the sum of its proper divisors (387539185).

3985855247 is a wasteful number, since it uses less digits than its factorization.

3985855247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3398.

The product of its digits is 12096000, while the sum is 56.

The square root of 3985855247 is about 63133.6300793800. The cubic root of 3985855247 is about 1585.5277257692.

The spelling of 3985855247 in words is "three billion, nine hundred eighty-five million, eight hundred fifty-five thousand, two hundred forty-seven".