5642639 has 4 divisors (see below), whose sum is σ = 5939640. Its totient is φ = 5345640.

The previous prime is 5642633. The next prime is 5642641. The reversal of 5642639 is 9362465.

5642639 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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-5642639 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 5642599 and 5642608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5642633) 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, 148472 + ... + 148509.

It is an arithmetic number, because the mean of its divisors is an integer number (1484910).

Almost surely, 2^5642639 is an apocalyptic number.

5642639 is a deficient number, since it is larger than the sum of its proper divisors (297001).

5642639 is a wasteful number, since it uses less digits than its factorization.

5642639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297000.

The product of its digits is 38880, while the sum is 35.

The square root of 5642639 is about 2375.4239621592. The cubic root of 5642639 is about 178.0303676674.

It can be divided in two parts, 56426 and 39, that added together give a palindrome (56465).

The spelling of 5642639 in words is "five million, six hundred forty-two thousand, six hundred thirty-nine".