1855980 has 96 divisors (see below), whose sum is σ = 6612480. Its totient is φ = 423360.

The previous prime is 1855979. The next prime is 1855981. The reversal of 1855980 is 895581.

It is an interprime number because it is at equal distance from previous prime (1855979) and next prime (1855981).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1855981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3535 + ... + 4025.

It is an arithmetic number, because the mean of its divisors is an integer number (68880).

2^1855980 is an apocalyptic number.

1855980 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 1855980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3306240).

1855980 is an abundant number, since it is smaller than the sum of its proper divisors (4756500).

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

1855980 is a wasteful number, since it uses less digits than its factorization.

1855980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516 (or 508 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 36.

The square root of 1855980 is about 1362.3435690016. The cubic root of 1855980 is about 122.8922316010.

The spelling of 1855980 in words is "one million, eight hundred fifty-five thousand, nine hundred eighty".