3638891 has 8 divisors (see below), whose sum is σ = 3790800. Its totient is φ = 3488800.

The previous prime is 3638879. The next prime is 3638903. The reversal of 3638891 is 1988363.

It is an interprime number because it is at equal distance from previous prime (3638879) and next prime (3638903).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3638891 - 2⁶ = 3638827 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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4841 + ... + 5541.

It is an arithmetic number, because the mean of its divisors is an integer number (473850).

Almost surely, 2^3638891 is an apocalyptic number.

3638891 is a deficient number, since it is larger than the sum of its proper divisors (151909).

3638891 is a wasteful number, since it uses less digits than its factorization.

3638891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909.

The product of its digits is 31104, while the sum is 38.

The square root of 3638891 is about 1907.5877437224. The cubic root of 3638891 is about 153.8118098145.

The spelling of 3638891 in words is "three million, six hundred thirty-eight thousand, eight hundred ninety-one".