4028381 has 16 divisors (see below), whose sum is σ = 4866048. Its totient is φ = 3260400.

The previous prime is 4028363. The next prime is 4028389. The reversal of 4028381 is 1838204.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4028381 is a prime.

It is a super-2 number, since 2×4028381² = 32455706962322, which contains 22 as substring.

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 4028381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4028389) 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 15 ways as a sum of consecutive naturals, for example, 20996 + ... + 21186.

It is an arithmetic number, because the mean of its divisors is an integer number (304128).

Almost surely, 2^4028381 is an apocalyptic number.

It is an amenable number.

4028381 is a deficient number, since it is larger than the sum of its proper divisors (837667).

4028381 is a wasteful number, since it uses less digits than its factorization.

4028381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 4028381 is about 2007.0827088090. The cubic root of 4028381 is about 159.1146543258.

The spelling of 4028381 in words is "four million, twenty-eight thousand, three hundred eighty-one".