3638491 has 2 divisors, whose sum is σ = 3638492. Its totient is φ = 3638490.

The previous prime is 3638489. The next prime is 3638497. The reversal of 3638491 is 1948363.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3638491 - 2¹ = 3638489 is a prime.

Together with 3638489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (3638497) 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, 1819245 + 1819246.

It is an arithmetic number, because the mean of its divisors is an integer number (1819246).

Almost surely, 2^3638491 is an apocalyptic number.

3638491 is a deficient number, since it is larger than the sum of its proper divisors (1).

3638491 is an equidigital number, since it uses as much as digits as its factorization.

3638491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 34.

The square root of 3638491 is about 1907.4828963847. The cubic root of 3638491 is about 153.8061737587.

The spelling of 3638491 in words is "three million, six hundred thirty-eight thousand, four hundred ninety-one".