3638857 has 4 divisors (see below), whose sum is σ = 3665556. Its totient is φ = 3612160.

The previous prime is 3638851. The next prime is 3638879. The reversal of 3638857 is 7588363.

3638857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7588363 = 2143 ⋅3541.

It can be written as a sum of positive squares in 2 ways, for example, as 2676496 + 962361 = 1636^2 + 981^2 .

It is a cyclic number.

It is not a de Polignac number, because 3638857 - 2¹⁵ = 3606089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3638851) 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 in 3 ways as a sum of consecutive naturals, for example, 13144 + ... + 13417.

It is an arithmetic number, because the mean of its divisors is an integer number (916389).

Almost surely, 2^3638857 is an apocalyptic number.

It is an amenable number.

3638857 is a deficient number, since it is larger than the sum of its proper divisors (26699).

3638857 is a wasteful number, since it uses less digits than its factorization.

3638857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26698.

The product of its digits is 120960, while the sum is 40.

The square root of 3638857 is about 1907.5788319228. The cubic root of 3638857 is about 153.8113307658.

The spelling of 3638857 in words is "three million, six hundred thirty-eight thousand, eight hundred fifty-seven".