3972281 has 4 divisors (see below), whose sum is σ = 3976272. Its totient is φ = 3968292.

The previous prime is 3972263. The next prime is 3972301. The reversal of 3972281 is 1822793.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1822793 = 7 ⋅260399.

It is a cyclic number.

It is not a de Polignac number, because 3972281 - 2¹⁰ = 3971257 is a prime.

It is a super-2 number, since 2×3972281² = 31558032685922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3972251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 866 + ... + 2948.

It is an arithmetic number, because the mean of its divisors is an integer number (994068).

Almost surely, 2^3972281 is an apocalyptic number.

It is an amenable number.

3972281 is a deficient number, since it is larger than the sum of its proper divisors (3991).

3972281 is a wasteful number, since it uses less digits than its factorization.

3972281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3990.

The product of its digits is 6048, while the sum is 32.

The square root of 3972281 is about 1993.0582028631. The cubic root of 3972281 is about 158.3725785143.

The spelling of 3972281 in words is "three million, nine hundred seventy-two thousand, two hundred eighty-one".