491220 has 36 divisors (see below), whose sum is σ = 1490580. Its totient is φ = 130944.

The previous prime is 491219. The next prime is 491251. The reversal of 491220 is 22194.

It can be written as a sum of positive squares in 2 ways, for example, as 352836 + 138384 = 594^2 + 372^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a junction number, because it is equal to n+sod(n) for n = 491193 and 491202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1185 + ... + 1544.

It is an arithmetic number, because the mean of its divisors is an integer number (41405).

2⁴⁹¹²²⁰ is an apocalyptic number.

It is an amenable number.

491220 is an abundant number, since it is smaller than the sum of its proper divisors (999360).

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

491220 is a wasteful number, since it uses less digits than its factorization.

491220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2744 (or 2739 counting only the distinct ones).

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

The square root of 491220 is about 700.8708868258. The cubic root of 491220 is about 78.9027270427.

The spelling of 491220 in words is "four hundred ninety-one thousand, two hundred twenty".