1806891099 has 8 divisors (see below), whose sum is σ = 2594510352. Its totient is φ = 1111932960.

The previous prime is 1806891091. The next prime is 1806891101. The reversal of 1806891099 is 9901986081.

It is a happy number.

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

It is not a de Polignac number, because 1806891099 - 2³ = 1806891091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1806891091) 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, 23165232 + ... + 23165309.

It is an arithmetic number, because the mean of its divisors is an integer number (324313794).

Almost surely, 2^1806891099 is an apocalyptic number.

1806891099 is a deficient number, since it is larger than the sum of its proper divisors (787619253).

1806891099 is a wasteful number, since it uses less digits than its factorization.

1806891099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46330557.

The product of its (nonzero) digits is 279936, while the sum is 51.

The square root of 1806891099 is about 42507.5416720374. The cubic root of 1806891099 is about 1217.9907577471.

The spelling of 1806891099 in words is "one billion, eight hundred six million, eight hundred ninety-one thousand, ninety-nine".