4947639 has 4 divisors (see below), whose sum is σ = 6596856. Its totient is φ = 3298424.

The previous prime is 4947617. The next prime is 4947653. The reversal of 4947639 is 9367494.

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

It is a cyclic number.

It is not a de Polignac number, because 4947639 - 2¹⁶ = 4882103 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 4947639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4947659) 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, 824604 + ... + 824609.

It is an arithmetic number, because the mean of its divisors is an integer number (1649214).

Almost surely, 2^4947639 is an apocalyptic number.

4947639 is a deficient number, since it is larger than the sum of its proper divisors (1649217).

4947639 is a wasteful number, since it uses less digits than its factorization.

4947639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1649216.

The product of its digits is 163296, while the sum is 42.

The square root of 4947639 is about 2224.3288875524. The cubic root of 4947639 is about 170.3985918132.

The spelling of 4947639 in words is "four million, nine hundred forty-seven thousand, six hundred thirty-nine".