4990638 has 16 divisors (see below), whose sum is σ = 10003536. Its totient is φ = 1659840.

The previous prime is 4990637. The next prime is 4990649. The reversal of 4990638 is 8360994.

It is a junction number, because it is equal to n+sod(n) for n = 4990596 and 4990605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4990631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4020 + ... + 5112.

It is an arithmetic number, because the mean of its divisors is an integer number (625221).

Almost surely, 2^4990638 is an apocalyptic number.

4990638 is an abundant number, since it is smaller than the sum of its proper divisors (5012898).

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

4990638 is a wasteful number, since it uses less digits than its factorization.

4990638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1859.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 4990638 is about 2233.9735898170. The cubic root of 4990638 is about 170.8908026887.

The spelling of 4990638 in words is "four million, nine hundred ninety thousand, six hundred thirty-eight".