4991823 has 12 divisors (see below), whose sum is σ = 7364448. Its totient is φ = 3256800.

The previous prime is 4991803. The next prime is 4991839. The reversal of 4991823 is 3281994.

It is not a de Polignac number, because 4991823 - 2¹³ = 4983631 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4991803) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5478 + ... + 6323.

It is an arithmetic number, because the mean of its divisors is an integer number (613704).

Almost surely, 2^4991823 is an apocalyptic number.

4991823 is a deficient number, since it is larger than the sum of its proper divisors (2372625).

4991823 is a wasteful number, since it uses less digits than its factorization.

4991823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11854 (or 11851 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 4991823 is about 2234.2387965479. The cubic root of 4991823 is about 170.9043273173.

The spelling of 4991823 in words is "four million, nine hundred ninety-one thousand, eight hundred twenty-three".