4639891 has 2 divisors, whose sum is σ = 4639892. Its totient is φ = 4639890.

The previous prime is 4639883. The next prime is 4639903. The reversal of 4639891 is 1989364.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4639891 - 2³ = 4639883 is a prime.

It is not a weakly prime, because it can be changed into another prime (4639871) 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 as a sum of consecutive naturals, namely, 2319945 + 2319946.

It is an arithmetic number, because the mean of its divisors is an integer number (2319946).

Almost surely, 2^4639891 is an apocalyptic number.

4639891 is a deficient number, since it is larger than the sum of its proper divisors (1).

4639891 is an equidigital number, since it uses as much as digits as its factorization.

4639891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 40.

The square root of 4639891 is about 2154.0406217154. The cubic root of 4639891 is about 166.7897122475.

The spelling of 4639891 in words is "four million, six hundred thirty-nine thousand, eight hundred ninety-one".