3968218197 has 6 divisors (see below), whose sum is σ = 5731870742. Its totient is φ = 2645478792.

The previous prime is 3968218181. The next prime is 3968218207. The reversal of 3968218197 is 7918128693.

It can be written as a sum of positive squares in only one way, i.e., 3840776676 + 127441521 = 61974^2 + 11289^2 .

It is not a de Polignac number, because 3968218197 - 2⁴ = 3968218181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3968218127) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 220456558 + ... + 220456575.

Almost surely, 2^3968218197 is an apocalyptic number.

It is an amenable number.

3968218197 is a deficient number, since it is larger than the sum of its proper divisors (1763652545).

3968218197 is a wasteful number, since it uses less digits than its factorization.

3968218197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440913139 (or 440913136 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 3968218197 is about 62993.7949087051. The cubic root of 3968218197 is about 1583.1856621600.

The spelling of 3968218197 in words is "three billion, nine hundred sixty-eight million, two hundred eighteen thousand, one hundred ninety-seven".