1855020 has 48 divisors (see below), whose sum is σ = 5322240. Its totient is φ = 482496.

The previous prime is 1855013. The next prime is 1855031. The reversal of 1855020 is 205581.

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, 2221 + ... + 2939.

It is an arithmetic number, because the mean of its divisors is an integer number (110880).

2^1855020 is an apocalyptic number.

1855020 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 1855020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2661120).

1855020 is an abundant number, since it is smaller than the sum of its proper divisors (3467220).

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

1855020 is a wasteful number, since it uses less digits than its factorization.

1855020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774 (or 772 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 1855020 is about 1361.9911893988. The cubic root of 1855020 is about 122.8710394026.

The spelling of 1855020 in words is "one million, eight hundred fifty-five thousand, twenty".