1797220 has 24 divisors (see below), whose sum is σ = 3939264. Its totient is φ = 687456.

The previous prime is 1797209. The next prime is 1797227. The reversal of 1797220 is 227971.

It is a happy number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (1797227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1494 + ... + 2413.

It is an arithmetic number, because the mean of its divisors is an integer number (164136).

2^1797220 is an apocalyptic number.

1797220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1797220 is an abundant number, since it is smaller than the sum of its proper divisors (2142044).

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

1797220 is a wasteful number, since it uses less digits than its factorization.

1797220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3939 (or 3937 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 1797220 is about 1340.6043413327. The cubic root of 1797220 is about 121.5813834901.

The spelling of 1797220 in words is "one million, seven hundred ninety-seven thousand, two hundred twenty".