2687869 has 2 divisors, whose sum is σ = 2687870. Its totient is φ = 2687868.

The previous prime is 2687857. The next prime is 2687879. The reversal of 2687869 is 9687862.

2687869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2679769 + 8100 = 1637^2 + 90^2 .

It is a cyclic number.

It is not a de Polignac number, because 2687869 - 2⁹ = 2687357 is a prime.

It is a super-2 number, since 2×2687869² = 14449279522322, which contains 22 as substring.

It is a Chen prime.

2687869 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2687809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1343934 + 1343935.

It is an arithmetic number, because the mean of its divisors is an integer number (1343935).

2^2687869 is an apocalyptic number.

It is an amenable number.

2687869 is a deficient number, since it is larger than the sum of its proper divisors (1).

2687869 is an equidigital number, since it uses as much as digits as its factorization.

2687869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 46.

The square root of 2687869 is about 1639.4721711575. The cubic root of 2687869 is about 139.0388070311.

The spelling of 2687869 in words is "two million, six hundred eighty-seven thousand, eight hundred sixty-nine".