4638891 has 4 divisors (see below), whose sum is σ = 6185192. Its totient is φ = 3092592.

The previous prime is 4638859. The next prime is 4638899. The reversal of 4638891 is 1988364.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 4638891 - 2⁵ = 4638859 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4638899) 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 3 ways as a sum of consecutive naturals, for example, 773146 + ... + 773151.

It is an arithmetic number, because the mean of its divisors is an integer number (1546298).

Almost surely, 2^4638891 is an apocalyptic number.

4638891 is a deficient number, since it is larger than the sum of its proper divisors (1546301).

4638891 is a wasteful number, since it uses less digits than its factorization.

4638891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1546300.

The product of its digits is 41472, while the sum is 39.

The square root of 4638891 is about 2153.8084873080. The cubic root of 4638891 is about 166.7777290855. Note that the first 4 decimals are identical.

The spelling of 4638891 in words is "four million, six hundred thirty-eight thousand, eight hundred ninety-one".