3639729 has 8 divisors (see below), whose sum is σ = 4880512. Its totient is φ = 2412720.

The previous prime is 3639719. The next prime is 3639733. The reversal of 3639729 is 9279363.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3639729 - 2⁸ = 3639473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3639719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2809 + ... + 3894.

It is an arithmetic number, because the mean of its divisors is an integer number (610064).

Almost surely, 2^3639729 is an apocalyptic number.

It is an amenable number.

3639729 is a deficient number, since it is larger than the sum of its proper divisors (1240783).

3639729 is a wasteful number, since it uses less digits than its factorization.

3639729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6887.

The product of its digits is 61236, while the sum is 39.

The square root of 3639729 is about 1907.8073802143. The cubic root of 3639729 is about 153.8236160126.

The spelling of 3639729 in words is "three million, six hundred thirty-nine thousand, seven hundred twenty-nine".