1943798865 has 8 divisors (see below), whose sum is σ = 3110078208. Its totient is φ = 1036692720.

The previous prime is 1943798849. The next prime is 1943798869. The reversal of 1943798865 is 5688973491.

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

It is not a de Polignac number, because 1943798865 - 2⁴ = 1943798849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1943798799 and 1943798808.

It is not an unprimeable number, because it can be changed into a prime (1943798869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64793281 + ... + 64793310.

It is an arithmetic number, because the mean of its divisors is an integer number (388759776).

Almost surely, 2^1943798865 is an apocalyptic number.

1943798865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1943798865 is a deficient number, since it is larger than the sum of its proper divisors (1166279343).

1943798865 is a wasteful number, since it uses less digits than its factorization.

1943798865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129586599.

The product of its digits is 13063680, while the sum is 60.

The square root of 1943798865 is about 44088.5343938761. The cubic root of 1943798865 is about 1248.0072493775.

The spelling of 1943798865 in words is "one billion, nine hundred forty-three million, seven hundred ninety-eight thousand, eight hundred sixty-five".