1916005805 has 8 divisors (see below), whose sum is σ = 2627665152. Its totient is φ = 1313832528.

The previous prime is 1916005801. The next prime is 1916005811. The reversal of 1916005805 is 5085006191.

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

It is a cyclic number.

It is not a de Polignac number, because 1916005805 - 2² = 1916005801 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35), and also a Moran number because the ratio is a prime number: 54743023 = 1916005805 / (1 + 9 + 1 + 6 + 0 + 0 + 5 + 8 + 0 + 5).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1916005801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27371477 + ... + 27371546.

It is an arithmetic number, because the mean of its divisors is an integer number (328458144).

Almost surely, 2^1916005805 is an apocalyptic number.

It is an amenable number.

1916005805 is a deficient number, since it is larger than the sum of its proper divisors (711659347).

1916005805 is an equidigital number, since it uses as much as digits as its factorization.

1916005805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54743035.

The product of its (nonzero) digits is 10800, while the sum is 35.

The square root of 1916005805 is about 43772.2035657334. The cubic root of 1916005805 is about 1242.0305365019.

The spelling of 1916005805 in words is "one billion, nine hundred sixteen million, five thousand, eight hundred five".