1865220 has 48 divisors (see below), whose sum is σ = 5970048. Its totient is φ = 426240.

The previous prime is 1865203. The next prime is 1865221. The reversal of 1865220 is 225681.

It is not an unprimeable number, because it can be changed into a prime (1865221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1801 + ... + 2640.

It is an arithmetic number, because the mean of its divisors is an integer number (124376).

2^1865220 is an apocalyptic number.

1865220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1865220 is an abundant number, since it is smaller than the sum of its proper divisors (4104828).

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

1865220 is a wasteful number, since it uses less digits than its factorization.

1865220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4460 (or 4458 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 1865220 is about 1365.7305737224. The cubic root of 1865220 is about 123.0958338330.

The spelling of 1865220 in words is "one million, eight hundred sixty-five thousand, two hundred twenty".