4020869 has 2 divisors, whose sum is σ = 4020870. Its totient is φ = 4020868.

The previous prime is 4020847. The next prime is 4020889. The reversal of 4020869 is 9680204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3276100 + 744769 = 1810^2 + 863^2 .

It is a cyclic number.

It is not a de Polignac number, because 4020869 - 2¹² = 4016773 is a prime.

It is a super-2 number, since 2×4020869² = 32334775030322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4020889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2010434 + 2010435.

It is an arithmetic number, because the mean of its divisors is an integer number (2010435).

Almost surely, 2^4020869 is an apocalyptic number.

It is an amenable number.

4020869 is a deficient number, since it is larger than the sum of its proper divisors (1).

4020869 is an equidigital number, since it uses as much as digits as its factorization.

4020869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 4020869 is about 2005.2104627694. The cubic root of 4020869 is about 159.0156887595.

The spelling of 4020869 in words is "four million, twenty thousand, eight hundred sixty-nine".