1856840 has 32 divisors (see below), whose sum is σ = 4251960. Its totient is φ = 729600.

The previous prime is 1856837. The next prime is 1856843. The reversal of 1856840 is 486581.

It is an interprime number because it is at equal distance from previous prime (1856837) and next prime (1856843).

It can be written as a sum of positive squares in 4 ways, for example, as 334084 + 1522756 = 578^2 + 1234^2 .

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1856797 and 1856806.

It is not an unprimeable number, because it can be changed into a prime (1856843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2060 + ... + 2820.

2^1856840 is an apocalyptic number.

1856840 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 1856840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2125980).

1856840 is an abundant number, since it is smaller than the sum of its proper divisors (2395120).

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

1856840 is a wasteful number, since it uses less digits than its factorization.

1856840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 833 (or 829 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 1856840 is about 1362.6591650152. The cubic root of 1856840 is about 122.9112100741.

The spelling of 1856840 in words is "one million, eight hundred fifty-six thousand, eight hundred forty".