3638109 has 4 divisors (see below), whose sum is σ = 4850816. Its totient is φ = 2425404.

The previous prime is 3638087. The next prime is 3638113. The reversal of 3638109 is 9018363.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9018363 = 3 ⋅3006121.

It is not a de Polignac number, because 3638109 - 2⁵ = 3638077 is a prime.

It is a D-number.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a Curzon number.

3638109 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3638149) 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 in 3 ways as a sum of consecutive naturals, for example, 606349 + ... + 606354.

It is an arithmetic number, because the mean of its divisors is an integer number (1212704).

Almost surely, 2^3638109 is an apocalyptic number.

It is an amenable number.

3638109 is a deficient number, since it is larger than the sum of its proper divisors (1212707).

3638109 is a wasteful number, since it uses less digits than its factorization.

3638109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1212706.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 3638109 is about 1907.3827617969. The cubic root of 3638109 is about 153.8007909398.

The spelling of 3638109 in words is "three million, six hundred thirty-eight thousand, one hundred nine".