5638739 has 4 divisors (see below), whose sum is σ = 5716056. Its totient is φ = 5561424.

The previous prime is 5638709. The next prime is 5638751. The reversal of 5638739 is 9378365.

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-5638739 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 5638696 and 5638705.

It is not an unprimeable number, because it can be changed into a prime (5638709) 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, 38549 + ... + 38694.

It is an arithmetic number, because the mean of its divisors is an integer number (1429014).

Almost surely, 2^5638739 is an apocalyptic number.

5638739 is a deficient number, since it is larger than the sum of its proper divisors (77317).

5638739 is an equidigital number, since it uses as much as digits as its factorization.

5638739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77316.

The product of its digits is 136080, while the sum is 41.

The square root of 5638739 is about 2374.6029141732. The cubic root of 5638739 is about 177.9893420374.

The spelling of 5638739 in words is "five million, six hundred thirty-eight thousand, seven hundred thirty-nine".