1955840 has 48 divisors (see below), whose sum is σ = 4717440. Its totient is φ = 778240.

The previous prime is 1955839. The next prime is 1955873. The reversal of 1955840 is 485591.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 1955797 and 1955806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10145 + ... + 10335.

It is an arithmetic number, because the mean of its divisors is an integer number (98280).

2^1955840 is an apocalyptic number.

1955840 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 1955840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2358720).

1955840 is an abundant number, since it is smaller than the sum of its proper divisors (2761600).

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

1955840 is an equidigital number, since it uses as much as digits as its factorization.

1955840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218 (or 198 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 1955840 is about 1398.5134965384. The cubic root of 1955840 is about 125.0578931829.

The spelling of 1955840 in words is "one million, nine hundred fifty-five thousand, eight hundred forty".