3965825218 has 4 divisors (see below), whose sum is σ = 5948737830. Its totient is φ = 1982912608.

The previous prime is 3965825191. The next prime is 3965825219. The reversal of 3965825218 is 8125285693.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 3203899609 + 761925609 = 56603^2 + 27603^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (3965825219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 991456303 + ... + 991456306.

Almost surely, 2^3965825218 is an apocalyptic number.

3965825218 is a deficient number, since it is larger than the sum of its proper divisors (1982912612).

3965825218 is a wasteful number, since it uses less digits than its factorization.

3965825218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1982912611.

The product of its digits is 1036800, while the sum is 49.

The square root of 3965825218 is about 62974.7982767710. The cubic root of 3965825218 is about 1582.8673587763.

The spelling of 3965825218 in words is "three billion, nine hundred sixty-five million, eight hundred twenty-five thousand, two hundred eighteen".