1798820 has 24 divisors (see below), whose sum is σ = 3851064. Its totient is φ = 705536.

The previous prime is 1798817. The next prime is 1798861. The reversal of 1798820 is 288971.

1798820 = T₉ + T₁₀ + ... + T₂₂₀.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 802816 + 996004 = 896^2 + 998^2 .

It is an unprimeable number.

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, 212 + ... + 1908.

It is an arithmetic number, because the mean of its divisors is an integer number (160461).

2^1798820 is an apocalyptic number.

1798820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1798820 is an abundant number, since it is smaller than the sum of its proper divisors (2052244).

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

1798820 is a wasteful number, since it uses less digits than its factorization.

1798820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1759 (or 1757 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 1798820 is about 1341.2009543689. The cubic root of 1798820 is about 121.6174526254.

The spelling of 1798820 in words is "one million, seven hundred ninety-eight thousand, eight hundred twenty".