4638858 has 64 divisors (see below), whose sum is σ = 11508480. Its totient is φ = 1216512.

The previous prime is 4638857. The next prime is 4638859. The reversal of 4638858 is 8588364.

It is an interprime number because it is at equal distance from previous prime (4638857) and next prime (4638859).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (4638857) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52078 + ... + 52166.

It is an arithmetic number, because the mean of its divisors is an integer number (179820).

Almost surely, 2^4638858 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4638858, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5754240).

4638858 is an abundant number, since it is smaller than the sum of its proper divisors (6869622).

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

4638858 is a wasteful number, since it uses less digits than its factorization.

4638858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191.

The product of its digits is 184320, while the sum is 42.

The square root of 4638858 is about 2153.8008264461. The cubic root of 4638858 is about 166.7773336118. Note that the first 3 decimals are identical.

The spelling of 4638858 in words is "four million, six hundred thirty-eight thousand, eight hundred fifty-eight".