4491000 has 96 divisors (see below), whose sum is σ = 15210000. Its totient is φ = 1195200.

The previous prime is 4490999. The next prime is 4491007. The reversal of 4491000 is 1944.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4491007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8751 + ... + 9249.

Almost surely, 2^4491000 is an apocalyptic number.

4491000 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4491000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7605000).

4491000 is an abundant number, since it is smaller than the sum of its proper divisors (10719000).

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

4491000 is a wasteful number, since it uses less digits than its factorization.

4491000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526 (or 509 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 4491000 is about 2119.1979614939. The cubic root of 4491000 is about 164.9862247453.

Adding to 4491000 its reverse (1944), we get a palindrome (4492944).

The spelling of 4491000 in words is "four million, four hundred ninety-one thousand".