1944800065 has 8 divisors (see below), whose sum is σ = 2513280168. Its totient is φ = 1436160000.

The previous prime is 1944800063. The next prime is 1944800069. The reversal of 1944800065 is 5600084491.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 156525121 + 1788274944 = 12511^2 + 42288^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1944800065 - 2¹ = 1944800063 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1944799997 and 1944800033.

It is not an unprimeable number, because it can be changed into a prime (1944800063) 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 7 ways as a sum of consecutive naturals, for example, 14959936 + ... + 14960065.

It is an arithmetic number, because the mean of its divisors is an integer number (314160021).

Almost surely, 2^1944800065 is an apocalyptic number.

It is an amenable number.

1944800065 is a deficient number, since it is larger than the sum of its proper divisors (568480103).

1944800065 is a wasteful number, since it uses less digits than its factorization.

1944800065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29920019.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 1944800065 is about 44099.8873581328. The cubic root of 1944800065 is about 1248.2214845731.

The spelling of 1944800065 in words is "one billion, nine hundred forty-four million, eight hundred thousand, sixty-five".