3639869 has 2 divisors, whose sum is σ = 3639870. Its totient is φ = 3639868.

The previous prime is 3639851. The next prime is 3639913. The reversal of 3639869 is 9689363.

It is an a-pointer prime, because the next prime (3639913) can be obtained adding 3639869 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1923769 + 1716100 = 1387^2 + 1310^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3639869 is a prime.

It is a super-2 number, since 2×3639869² = 26497292674322, which contains 22 as substring.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3639829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1819934 + 1819935.

It is an arithmetic number, because the mean of its divisors is an integer number (1819935).

Almost surely, 2^3639869 is an apocalyptic number.

It is an amenable number.

3639869 is a deficient number, since it is larger than the sum of its proper divisors (1).

3639869 is an equidigital number, since it uses as much as digits as its factorization.

3639869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209952, while the sum is 44.

The square root of 3639869 is about 1907.8440711966. The cubic root of 3639869 is about 153.8255882318.

The spelling of 3639869 in words is "three million, six hundred thirty-nine thousand, eight hundred sixty-nine".