3631639 has 4 divisors (see below), whose sum is σ = 3961800. Its totient is φ = 3301480.

The previous prime is 3631637. The next prime is 3631703. The reversal of 3631639 is 9361363.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9361363 = 11 ⋅851033.

It is a cyclic number.

It is not a de Polignac number, because 3631639 - 2¹ = 3631637 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3631639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3631633) 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, 165064 + ... + 165085.

It is an arithmetic number, because the mean of its divisors is an integer number (990450).

Almost surely, 2^3631639 is an apocalyptic number.

3631639 is a deficient number, since it is larger than the sum of its proper divisors (330161).

3631639 is a wasteful number, since it uses less digits than its factorization.

3631639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330160.

The product of its digits is 8748, while the sum is 31.

The square root of 3631639 is about 1905.6859657352. The cubic root of 3631639 is about 153.7095639141.

It can be divided in two parts, 363 and 1639, that added together give a palindrome (2002).

The spelling of 3631639 in words is "three million, six hundred thirty-one thousand, six hundred thirty-nine".