4978638 has 32 divisors (see below), whose sum is σ = 12645120. Its totient is φ = 1422360.

The previous prime is 4978607. The next prime is 4978651. The reversal of 4978638 is 8368794.

It is a happy number.

4978638 is a `hidden beast` number, since 4 + 9 + 7 + 8 + 638 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 4978593 and 4978602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6208 + ... + 6963.

It is an arithmetic number, because the mean of its divisors is an integer number (395160).

Almost surely, 2^4978638 is an apocalyptic number.

4978638 is an abundant number, since it is smaller than the sum of its proper divisors (7666482).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4978638 is a wasteful number, since it uses less digits than its factorization.

4978638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13189 (or 13183 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 4978638 is about 2231.2861761773. The cubic root of 4978638 is about 170.7537236579.

It can be divided in two parts, 49 and 78638, that added together give a palindrome (78687).

The spelling of 4978638 in words is "four million, nine hundred seventy-eight thousand, six hundred thirty-eight".