1820091818 has 8 divisors (see below), whose sum is σ = 2730366912. Its totient is φ = 909969516.

The previous prime is 1820091799. The next prime is 1820091841. The reversal of 1820091818 is 8181900281.

It is a happy number.

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1280 + ... + 60347.

It is an arithmetic number, because the mean of its divisors is an integer number (341295864).

Almost surely, 2^1820091818 is an apocalyptic number.

1820091818 is a deficient number, since it is larger than the sum of its proper divisors (910275094).

1820091818 is a wasteful number, since it uses less digits than its factorization.

1820091818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76396.

The product of its (nonzero) digits is 9216, while the sum is 38.

The square root of 1820091818 is about 42662.5341253892. The cubic root of 1820091818 is about 1220.9496811365.

The spelling of 1820091818 in words is "one billion, eight hundred twenty million, ninety-one thousand, eight hundred eighteen".