3640439 has 8 divisors (see below), whose sum is σ = 3996432. Its totient is φ = 3288640.

The previous prime is 3640409. The next prime is 3640447. The reversal of 3640439 is 9340463.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3640439 is a prime.

It is a super-2 number, since 2×3640439² = 26505592225442, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3640409) 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, 947 + ... + 2859.

It is an arithmetic number, because the mean of its divisors is an integer number (499554).

Almost surely, 2^3640439 is an apocalyptic number.

3640439 is a deficient number, since it is larger than the sum of its proper divisors (355993).

3640439 is a wasteful number, since it uses less digits than its factorization.

3640439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2097.

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 3640439 is about 1907.9934486261. The cubic root of 3640439 is about 153.8336174593.

The spelling of 3640439 in words is "three million, six hundred forty thousand, four hundred thirty-nine".