5639965 has 4 divisors (see below), whose sum is σ = 6767964. Its totient is φ = 4511968.

The previous prime is 5639939. The next prime is 5639969. The reversal of 5639965 is 5699365.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2247001 + 3392964 = 1499^2 + 1842^2 .

It is a cyclic number.

It is not a de Polignac number, because 5639965 - 2⁹ = 5639453 is a prime.

It is a Duffinian number.

5639965 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5639969) 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, 563992 + ... + 564001.

It is an arithmetic number, because the mean of its divisors is an integer number (1691991).

Almost surely, 2^5639965 is an apocalyptic number.

It is an amenable number.

5639965 is a deficient number, since it is larger than the sum of its proper divisors (1127999).

5639965 is a wasteful number, since it uses less digits than its factorization.

5639965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1127998.

The product of its digits is 218700, while the sum is 43.

The square root of 5639965 is about 2374.8610485668. The cubic root of 5639965 is about 178.0022408505.

It can be divided in two parts, 563996 and 5, that added together give a square (564001 = 751²).

The spelling of 5639965 in words is "five million, six hundred thirty-nine thousand, nine hundred sixty-five".