3972647281 has 8 divisors (see below), whose sum is σ = 4244149280. Its totient is φ = 3707386848.

The previous prime is 3972647279. The next prime is 3972647291. The reversal of 3972647281 is 1827462793.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3972647281 - 2¹ = 3972647279 is a prime.

It is a super-2 number, since 2×3972647281² = 31563852838473385922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3972647291) 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 7 ways as a sum of consecutive naturals, for example, 1559076 + ... + 1561621.

It is an arithmetic number, because the mean of its divisors is an integer number (530518660).

Almost surely, 2^3972647281 is an apocalyptic number.

It is an amenable number.

3972647281 is a deficient number, since it is larger than the sum of its proper divisors (271501999).

3972647281 is a wasteful number, since it uses less digits than its factorization.

3972647281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3120783.

The product of its digits is 1016064, while the sum is 49.

The square root of 3972647281 is about 63028.9400275778. The cubic root of 3972647281 is about 1583.7744616952.

The spelling of 3972647281 in words is "three billion, nine hundred seventy-two million, six hundred forty-seven thousand, two hundred eighty-one".