3967255289209 has 3 divisors (see below), whose sum is σ = 3967257281007. Its totient is φ = 3967253297412.

The previous prime is 3967255289171. The next prime is 3967255289219. The reversal of 3967255289209 is 9029825527693.

The square root of 3967255289209 is 1991797.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 3696409986025 + 270845303184 = 1922605^2 + 520428^2 .

It is a de Polignac number, because none of the positive numbers 2^k-3967255289209 is a prime.

It is a super-2 number, since 2×3967255289209² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3967255289219) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 995899 + ... + 2987695.

It is an arithmetic number, because the mean of its divisors is an integer number (1322419093669).

Almost surely, 2^{3967255289209} is an apocalyptic number.

3967255289209 is the 1991797-th square number.

3967255289209 is the 995899-th centered octagonal number.

It is an amenable number.

3967255289209 is a deficient number, since it is larger than the sum of its proper divisors (1991798).

3967255289209 is an frugal number, since it uses more digits than its factorization.

3967255289209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3983594 (or 1991797 counting only the distinct ones).

The product of its (nonzero) digits is 146966400, while the sum is 67.

The spelling of 3967255289209 in words is "three trillion, nine hundred sixty-seven billion, two hundred fifty-five million, two hundred eighty-nine thousand, two hundred nine".