3639744 has 84 divisors (see below), whose sum is σ = 10698480. Its totient is φ = 1182720.

The previous prime is 3639743. The next prime is 3639763. The reversal of 3639744 is 4479363.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 3639699 and 3639708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3639743) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40852 + ... + 40940.

Almost surely, 2^3639744 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3639744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5349240).

3639744 is an abundant number, since it is smaller than the sum of its proper divisors (7058736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3639744 is a wasteful number, since it uses less digits than its factorization.

3639744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178 (or 165 counting only the distinct ones).

The product of its digits is 54432, while the sum is 36.

The square root of 3639744 is about 1907.8113114247. The cubic root of 3639744 is about 153.8238273242.

The spelling of 3639744 in words is "three million, six hundred thirty-nine thousand, seven hundred forty-four".