3968781 has 4 divisors (see below), whose sum is σ = 5291712. Its totient is φ = 2645852.

The previous prime is 3968761. The next prime is 3968801. The reversal of 3968781 is 1878693.

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.

It is an interprime number because it is at equal distance from previous prime (3968761) and next prime (3968801).

It is a cyclic number.

It is not a de Polignac number, because 3968781 - 2⁶ = 3968717 is a prime.

It is a super-2 number, since 2×3968781² = 31502445251922, which contains 22 as substring.

It is a D-number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3968761) 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, 661461 + ... + 661466.

It is an arithmetic number, because the mean of its divisors is an integer number (1322928).

Almost surely, 2^3968781 is an apocalyptic number.

It is an amenable number.

3968781 is a deficient number, since it is larger than the sum of its proper divisors (1322931).

3968781 is a wasteful number, since it uses less digits than its factorization.

3968781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1322930.

The product of its digits is 72576, while the sum is 42.

The square root of 3968781 is about 1992.1799617504. The cubic root of 3968781 is about 158.3260505114.

The spelling of 3968781 in words is "three million, nine hundred sixty-eight thousand, seven hundred eighty-one".