3648639 has 4 divisors (see below), whose sum is σ = 4864856. Its totient is φ = 2432424.

The previous prime is 3648587. The next prime is 3648643. The reversal of 3648639 is 9368463.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 3648639 - 2⁷ = 3648511 is a prime.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3648597 and 3648606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3648649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 608104 + ... + 608109.

It is an arithmetic number, because the mean of its divisors is an integer number (1216214).

Almost surely, 2^3648639 is an apocalyptic number.

3648639 is a deficient number, since it is larger than the sum of its proper divisors (1216217).

3648639 is a wasteful number, since it uses less digits than its factorization.

3648639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1216216.

The product of its digits is 93312, while the sum is 39.

The square root of 3648639 is about 1910.1410942650. The cubic root of 3648639 is about 153.9490330020.

The spelling of 3648639 in words is "three million, six hundred forty-eight thousand, six hundred thirty-nine".