3968641 has 4 divisors (see below), whose sum is σ = 3986352. Its totient is φ = 3950932.

The previous prime is 3968617. The next prime is 3968647. The reversal of 3968641 is 1468693.

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 an emirpimes, since its reverse is a distinct semiprime: 1468693 = 149 ⋅9857.

It is a cyclic number.

It is not a de Polignac number, because 3968641 - 2¹⁷ = 3837569 is a prime.

It is a super-2 number, since 2×3968641² = 31500222773762, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3968641.

It is not an unprimeable number, because it can be changed into a prime (3968647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8515 + ... + 8968.

It is an arithmetic number, because the mean of its divisors is an integer number (996588).

Almost surely, 2^3968641 is an apocalyptic number.

It is an amenable number.

3968641 is a deficient number, since it is larger than the sum of its proper divisors (17711).

3968641 is a wasteful number, since it uses less digits than its factorization.

3968641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17710.

The product of its digits is 31104, while the sum is 37.

The square root of 3968641 is about 1992.1448240527. The cubic root of 3968641 is about 158.3241888224.

The spelling of 3968641 in words is "three million, nine hundred sixty-eight thousand, six hundred forty-one".