3639491 has 4 divisors (see below), whose sum is σ = 3655752. Its totient is φ = 3623232.

The previous prime is 3639487. The next prime is 3639499. The reversal of 3639491 is 1949363.

3639491 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.

It is a cyclic number.

It is not a de Polignac number, because 3639491 - 2² = 3639487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3639499) 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, 7790 + ... + 8243.

It is an arithmetic number, because the mean of its divisors is an integer number (913938).

Almost surely, 2^3639491 is an apocalyptic number.

3639491 is a deficient number, since it is larger than the sum of its proper divisors (16261).

3639491 is a wasteful number, since it uses less digits than its factorization.

3639491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16260.

The product of its digits is 17496, while the sum is 35.

The square root of 3639491 is about 1907.7450039248. The cubic root of 3639491 is about 153.8202631239.

The spelling of 3639491 in words is "three million, six hundred thirty-nine thousand, four hundred ninety-one".