1995840 has 280 divisors, whose sum is σ = 8851392. Its totient is φ = 414720.

The previous prime is 1995827. The next prime is 1995841. The reversal of 1995840 is 485991.

It is a tau number, because it is divible by the number of its divisors (280).

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

It is a junction number, because it is equal to n+sod(n) for n = 1995795 and 1995804.

It is not an unprimeable number, because it can be changed into a prime (1995841) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 181435 + ... + 181445.

2^1995840 is an apocalyptic number.

1995840 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 1995840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4425696).

1995840 is an abundant number, since it is smaller than the sum of its proper divisors (6855552).

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

1995840 is a wasteful number, since it uses less digits than its factorization.

1995840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47 (or 28 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 1995840 is about 1412.7420146651. The cubic root of 1995840 is about 125.9046898275.

It can be divided in two parts, 19 and 95840, that added together give a palindrome (95859).

The spelling of 1995840 in words is "one million, nine hundred ninety-five thousand, eight hundred forty".