1865856 has 64 divisors (see below), whose sum is σ = 5116320. Its totient is φ = 602112.

The previous prime is 1865849. The next prime is 1865863. The reversal of 1865856 is 6585681.

It is an interprime number because it is at equal distance from previous prime (1865849) and next prime (1865863).

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×1865856² = 6962837225472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16456 + ... + 16568.

2^1865856 is an apocalyptic number.

1865856 is a gapful number since it is divisible by the number (16) 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 1865856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2558160).

1865856 is an abundant number, since it is smaller than the sum of its proper divisors (3250464).

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

1865856 is a wasteful number, since it uses less digits than its factorization.

1865856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173 (or 161 counting only the distinct ones).

The product of its digits is 57600, while the sum is 39.

The square root of 1865856 is about 1365.9633962885. The cubic root of 1865856 is about 123.1098232558.

The spelling of 1865856 in words is "one million, eight hundred sixty-five thousand, eight hundred fifty-six".