4021881 has 4 divisors (see below), whose sum is σ = 5362512. Its totient is φ = 2681252.

The previous prime is 4021879. The next prime is 4021889. The reversal of 4021881 is 1881204.

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 a cyclic number.

It is not a de Polignac number, because 4021881 - 2¹ = 4021879 is a prime.

It is a super-2 number, since 2×4021881² = 32351053556322, which contains 22 as substring.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (4021889) 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, 670311 + ... + 670316.

It is an arithmetic number, because the mean of its divisors is an integer number (1340628).

Almost surely, 2^4021881 is an apocalyptic number.

It is an amenable number.

4021881 is a deficient number, since it is larger than the sum of its proper divisors (1340631).

4021881 is a wasteful number, since it uses less digits than its factorization.

4021881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340630.

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 4021881 is about 2005.4627894828. The cubic root of 4021881 is about 159.0290283617.

The spelling of 4021881 in words is "four million, twenty-one thousand, eight hundred eighty-one".