1995559840 has 96 divisors (see below), whose sum is σ = 4837916160. Its totient is φ = 777498624.

The previous prime is 1995559823. The next prime is 1995559843. The reversal of 1995559840 is 489555991.

1995559840 = T₂₇₁ + T₂₇₂ + ... + T₂₂₈₈.

It is not an unprimeable number, because it can be changed into a prime (1995559843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1977256 + ... + 1978264.

It is an arithmetic number, because the mean of its divisors is an integer number (50394960).

Almost surely, 2^1995559840 is an apocalyptic number.

1995559840 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 1995559840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2418958080).

1995559840 is an abundant number, since it is smaller than the sum of its proper divisors (2842356320).

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

1995559840 is a wasteful number, since it uses less digits than its factorization.

1995559840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1334 (or 1326 counting only the distinct ones).

The product of its (nonzero) digits is 2916000, while the sum is 55.

The square root of 1995559840 is about 44671.6894688347. The cubic root of 1995559840 is about 1258.9879838853.

The spelling of 1995559840 in words is "one billion, nine hundred ninety-five million, five hundred fifty-nine thousand, eight hundred forty".