3947993825 has 12 divisors (see below), whose sum is σ = 4898553660. Its totient is φ = 3156432960.

The previous prime is 3947993821. The next prime is 3947993839. The reversal of 3947993825 is 5283997493.

It can be written as a sum of positive squares in 6 ways, for example, as 1270138321 + 2677855504 = 35639^2 + 51748^2 .

It is not a de Polignac number, because 3947993825 - 2² = 3947993821 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3947993821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7310 + ... + 89159.

It is an arithmetic number, because the mean of its divisors is an integer number (408212805).

Almost surely, 2^3947993825 is an apocalyptic number.

It is an amenable number.

3947993825 is a deficient number, since it is larger than the sum of its proper divisors (950559835).

3947993825 is a wasteful number, since it uses less digits than its factorization.

3947993825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98116 (or 98111 counting only the distinct ones).

The product of its digits is 14696640, while the sum is 59.

The square root of 3947993825 is about 62833.0631514969. The cubic root of 3947993825 is about 1580.4914650419.

The spelling of 3947993825 in words is "three billion, nine hundred forty-seven million, nine hundred ninety-three thousand, eight hundred twenty-five".