4021879 has 2 divisors, whose sum is σ = 4021880. Its totient is φ = 4021878.

The previous prime is 4021873. The next prime is 4021889. The reversal of 4021879 is 9781204.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4021879 - 2⁷ = 4021751 is a prime.

It is a Chen prime.

It is equal to p₂₈₄₅₈₄ and since 4021879 and 284584 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4021879.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4021873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2010939 + 2010940.

It is an arithmetic number, because the mean of its divisors is an integer number (2010940).

Almost surely, 2^4021879 is an apocalyptic number.

4021879 is a deficient number, since it is larger than the sum of its proper divisors (1).

4021879 is an equidigital number, since it uses as much as digits as its factorization.

4021879 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 4021879 is about 2005.4622908447. The cubic root of 4021879 is about 159.0290020010.

It can be divided in two parts, 4021 and 879, that added together give a square (4900 = 70²).

The spelling of 4021879 in words is "four million, twenty-one thousand, eight hundred seventy-nine".