4978639 has 4 divisors (see below), whose sum is σ = 4989856. Its totient is φ = 4967424.

The previous prime is 4978607. The next prime is 4978651. The reversal of 4978639 is 9368794.

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 4978639 - 2⁵ = 4978607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4975639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4914 + ... + 5839.

It is an arithmetic number, because the mean of its divisors is an integer number (1247464).

Almost surely, 2^4978639 is an apocalyptic number.

4978639 is a deficient number, since it is larger than the sum of its proper divisors (11217).

4978639 is a wasteful number, since it uses less digits than its factorization.

4978639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11216.

The product of its digits is 326592, while the sum is 46.

The square root of 4978639 is about 2231.2864002633. The cubic root of 4978639 is about 170.7537350903.

The spelling of 4978639 in words is "four million, nine hundred seventy-eight thousand, six hundred thirty-nine".