1865920 has 112 divisors (see below), whose sum is σ = 5486400. Its totient is φ = 602112.

The previous prime is 1865917. The next prime is 1865939. The reversal of 1865920 is 295681.

It is a tau number, because it is divible by the number of its divisors (112).

It is a zygodrome in base 2.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109752 + ... + 109768.

2^1865920 is an apocalyptic number.

1865920 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 1865920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2743200).

1865920 is an abundant number, since it is smaller than the sum of its proper divisors (3620480).

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

1865920 is an equidigital number, since it uses as much as digits as its factorization.

1865920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55 (or 31 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 1865920 is about 1365.9868227769. The cubic root of 1865920 is about 123.1112308204. Note that the first 3 decimals are identical.

The spelling of 1865920 in words is "one million, eight hundred sixty-five thousand, nine hundred twenty".