5209639 has 4 divisors (see below), whose sum is σ = 5255856. Its totient is φ = 5163424.

The previous prime is 5209627. The next prime is 5209657. The reversal of 5209639 is 9369025.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5209639 is a prime.

5209639 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5209619) 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, 22939 + ... + 23164.

It is an arithmetic number, because the mean of its divisors is an integer number (1313964).

Almost surely, 2^5209639 is an apocalyptic number.

5209639 is a deficient number, since it is larger than the sum of its proper divisors (46217).

5209639 is a wasteful number, since it uses less digits than its factorization.

5209639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46216.

The product of its (nonzero) digits is 14580, while the sum is 34.

The square root of 5209639 is about 2282.4633622470. The cubic root of 5209639 is about 173.3548021567.

The spelling of 5209639 in words is "five million, two hundred nine thousand, six hundred thirty-nine".