3965821396 has 6 divisors (see below), whose sum is σ = 6940187450. Its totient is φ = 1982910696.

The previous prime is 3965821373. The next prime is 3965821397. The reversal of 3965821396 is 6931285693.

It can be written as a sum of positive squares in only one way, i.e., 3426931600 + 538889796 = 58540^2 + 23214^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3965821397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495727671 + ... + 495727678.

Almost surely, 2^3965821396 is an apocalyptic number.

It is an amenable number.

3965821396 is a deficient number, since it is larger than the sum of its proper divisors (2974366054).

3965821396 is a wasteful number, since it uses less digits than its factorization.

3965821396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991455353 (or 991455351 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 52.

The square root of 3965821396 is about 62974.7679312913. The cubic root of 3965821396 is about 1582.8668502885.

The spelling of 3965821396 in words is "three billion, nine hundred sixty-five million, eight hundred twenty-one thousand, three hundred ninety-six".