4951638 has 32 divisors (see below), whose sum is σ = 11243520. Its totient is φ = 1614600.

The previous prime is 4951637. The next prime is 4951643. The reversal of 4951638 is 8361594.

4951638 is a `hidden beast` number, since 495 + 163 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4951633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1563 + ... + 3513.

It is an arithmetic number, because the mean of its divisors is an integer number (351360).

Almost surely, 2^4951638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4951638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5621760).

4951638 is an abundant number, since it is smaller than the sum of its proper divisors (6291882).

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

4951638 is a wasteful number, since it uses less digits than its factorization.

4951638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2009 (or 2003 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 4951638 is about 2225.2276288056. The cubic root of 4951638 is about 170.4444884830. Note that the first 4 decimals are identical.

The spelling of 4951638 in words is "four million, nine hundred fifty-one thousand, six hundred thirty-eight".