4991845 has 8 divisors (see below), whose sum is σ = 6007320. Its totient is φ = 3982080.

The previous prime is 4991843. The next prime is 4991849. The reversal of 4991845 is 5481994.

It can be written as a sum of positive squares in 4 ways, for example, as 527076 + 4464769 = 726^2 + 2113^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4991845 - 2¹ = 4991843 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4991798 and 4991807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4991843) 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 7 ways as a sum of consecutive naturals, for example, 825 + ... + 3265.

It is an arithmetic number, because the mean of its divisors is an integer number (750915).

Almost surely, 2^4991845 is an apocalyptic number.

It is an amenable number.

4991845 is a deficient number, since it is larger than the sum of its proper divisors (1015475).

4991845 is a wasteful number, since it uses less digits than its factorization.

4991845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2855.

The product of its digits is 51840, while the sum is 40.

The square root of 4991845 is about 2234.2437199196. The cubic root of 4991845 is about 170.9045783872.

The spelling of 4991845 in words is "four million, nine hundred ninety-one thousand, eight hundred forty-five".