4991820 has 48 divisors (see below), whose sum is σ = 14074368. Its totient is φ = 1321920.

The previous prime is 4991803. The next prime is 4991839. The reversal of 4991820 is 281994.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16107 + ... + 16413.

It is an arithmetic number, because the mean of its divisors is an integer number (293216).

Almost surely, 2^4991820 is an apocalyptic number.

It is an amenable number.

4991820 is an abundant number, since it is smaller than the sum of its proper divisors (9082548).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4991820 is a wasteful number, since it uses less digits than its factorization.

4991820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590 (or 588 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 4991820 is about 2234.2381251782. The cubic root of 4991820 is about 170.9042930804.

The spelling of 4991820 in words is "four million, nine hundred ninety-one thousand, eight hundred twenty".