4991939 has 4 divisors (see below), whose sum is σ = 5062320. Its totient is φ = 4921560.

The previous prime is 4991933. The next prime is 4991951. The reversal of 4991939 is 9391994.

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

It is a cyclic number.

It is not a de Polignac number, because 4991939 - 2⁴ = 4991923 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4991939.

It is not an unprimeable number, because it can be changed into a prime (4991933) 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, 35084 + ... + 35225.

It is an arithmetic number, because the mean of its divisors is an integer number (1265580).

Almost surely, 2^4991939 is an apocalyptic number.

4991939 is a deficient number, since it is larger than the sum of its proper divisors (70381).

4991939 is an equidigital number, since it uses as much as digits as its factorization.

4991939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70380.

The product of its digits is 78732, while the sum is 44.

The square root of 4991939 is about 2234.2647560215. The cubic root of 4991939 is about 170.9056511321.

The spelling of 4991939 in words is "four million, nine hundred ninety-one thousand, nine hundred thirty-nine".