1855840 has 48 divisors (see below), whose sum is σ = 5013792. Its totient is φ = 635904.

The previous prime is 1855823. The next prime is 1855849. The reversal of 1855840 is 485581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1855849) 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, 292 + ... + 1948.

It is an arithmetic number, because the mean of its divisors is an integer number (104454).

2^1855840 is an apocalyptic number.

1855840 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 1855840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2506896).

1855840 is an abundant number, since it is smaller than the sum of its proper divisors (3157952).

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

1855840 is a wasteful number, since it uses less digits than its factorization.

1855840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1679 (or 1671 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 31.

The square root of 1855840 is about 1362.2921859865. The cubic root of 1855840 is about 122.8891415273.

The spelling of 1855840 in words is "one million, eight hundred fifty-five thousand, eight hundred forty".