3921281 has 16 divisors (see below), whose sum is σ = 4948608. Its totient is φ = 3024000.

The previous prime is 3921227. The next prime is 3921287. The reversal of 3921281 is 1821293.

It is not a de Polignac number, because 3921281 - 2⁶ = 3921217 is a prime.

It is a super-2 number, since 2×3921281² = 30752889361922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3921281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3921287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3206 + ... + 4256.

It is an arithmetic number, because the mean of its divisors is an integer number (309288).

Almost surely, 2^3921281 is an apocalyptic number.

It is an amenable number.

3921281 is a deficient number, since it is larger than the sum of its proper divisors (1027327).

3921281 is a wasteful number, since it uses less digits than its factorization.

3921281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112.

The product of its digits is 864, while the sum is 26.

The square root of 3921281 is about 1980.2224622501. Note that the first 3 decimals coincide. The cubic root of 3921281 is about 157.6918766717.

It can be divided in two parts, 39212 and 81, that added together give a palindrome (39293).

The spelling of 3921281 in words is "three million, nine hundred twenty-one thousand, two hundred eighty-one".