1799864 has 32 divisors (see below), whose sum is σ = 3734640. Its totient is φ = 806400.

The previous prime is 1799849. The next prime is 1799867. The reversal of 1799864 is 4689971.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1799867) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 9854 + ... + 10034.

2^1799864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1799864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1867320).

1799864 is an abundant number, since it is smaller than the sum of its proper divisors (1934776).

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

1799864 is a wasteful number, since it uses less digits than its factorization.

1799864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311 (or 307 counting only the distinct ones).

The product of its digits is 108864, while the sum is 44.

The square root of 1799864 is about 1341.5901013350. The cubic root of 1799864 is about 121.6409762066.

The spelling of 1799864 in words is "one million, seven hundred ninety-nine thousand, eight hundred sixty-four".