1799840 has 48 divisors (see below), whose sum is σ = 4862592. Its totient is φ = 616704.

The previous prime is 1799839. The next prime is 1799843. The reversal of 1799840 is 489971.

It is a junction number, because it is equal to n+sod(n) for n = 1799794 and 1799803.

It is not an unprimeable number, because it can be changed into a prime (1799843) 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, 317 + ... + 1923.

It is an arithmetic number, because the mean of its divisors is an integer number (101304).

2^1799840 is an apocalyptic number.

1799840 is a gapful number since it is divisible by the number (10) 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 1799840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2431296).

1799840 is an abundant number, since it is smaller than the sum of its proper divisors (3062752).

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

1799840 is a wasteful number, since it uses less digits than its factorization.

1799840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1629 (or 1621 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 1799840 is about 1341.5811566953. The cubic root of 1799840 is about 121.6404355368.

The spelling of 1799840 in words is "one million, seven hundred ninety-nine thousand, eight hundred forty".