4491820 has 12 divisors (see below), whose sum is σ = 9432864. Its totient is φ = 1796720.

The previous prime is 4491811. The next prime is 4491827. The reversal of 4491820 is 281944.

It is not an unprimeable number, because it can be changed into a prime (4491827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112276 + ... + 112315.

It is an arithmetic number, because the mean of its divisors is an integer number (786072).

Almost surely, 2^4491820 is an apocalyptic number.

It is an amenable number.

4491820 is an abundant number, since it is smaller than the sum of its proper divisors (4941044).

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

4491820 is a wasteful number, since it uses less digits than its factorization.

4491820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224600 (or 224598 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 4491820 is about 2119.3914220832. The cubic root of 4491820 is about 164.9962656027.

The spelling of 4491820 in words is "four million, four hundred ninety-one thousand, eight hundred twenty".