3639725 has 6 divisors (see below), whose sum is σ = 4513290. Its totient is φ = 2911760.

The previous prime is 3639719. The next prime is 3639733. The reversal of 3639725 is 5279363.

It can be written as a sum of positive squares in 3 ways, for example, as 6889 + 3632836 = 83^2 + 1906^2 .

It is not a de Polignac number, because 3639725 - 2⁶ = 3639661 is a prime.

It is a d-powerful number, because it can be written as 3¹⁰ + 6² + 3¹³ + 9² + 7³ + 2¹⁵ + 5⁹ .

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 72770 + ... + 72819.

It is an arithmetic number, because the mean of its divisors is an integer number (752215).

Almost surely, 2^3639725 is an apocalyptic number.

It is an amenable number.

3639725 is a deficient number, since it is larger than the sum of its proper divisors (873565).

3639725 is a wasteful number, since it uses less digits than its factorization.

3639725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145599 (or 145594 counting only the distinct ones).

The product of its digits is 34020, while the sum is 35.

The square root of 3639725 is about 1907.8063318901. The cubic root of 3639725 is about 153.8235596627.

The spelling of 3639725 in words is "three million, six hundred thirty-nine thousand, seven hundred twenty-five".