4781993 has 2 divisors, whose sum is σ = 4781994. Its totient is φ = 4781992.

The previous prime is 4781989. The next prime is 4782023. The reversal of 4781993 is 3991874.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4481689 + 300304 = 2117^2 + 548^2 .

It is a cyclic number.

It is not a de Polignac number, because 4781993 - 2² = 4781989 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4781993.

It is not a weakly prime, because it can be changed into another prime (4781923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2390996 + 2390997.

It is an arithmetic number, because the mean of its divisors is an integer number (2390997).

Almost surely, 2^4781993 is an apocalyptic number.

It is an amenable number.

4781993 is a deficient number, since it is larger than the sum of its proper divisors (1).

4781993 is an equidigital number, since it uses as much as digits as its factorization.

4781993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 41.

The square root of 4781993 is about 2186.7768518987. The cubic root of 4781993 is about 168.4753285647.

The spelling of 4781993 in words is "four million, seven hundred eighty-one thousand, nine hundred ninety-three".