1811668442 has 8 divisors (see below), whose sum is σ = 2743886496. Its totient is φ = 897039612.

The previous prime is 1811668421. The next prime is 1811668451. The reversal of 1811668442 is 2448661181.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1811668442.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4397048 + ... + 4397459.

It is an arithmetic number, because the mean of its divisors is an integer number (342985812).

Almost surely, 2^1811668442 is an apocalyptic number.

1811668442 is a deficient number, since it is larger than the sum of its proper divisors (932218054).

1811668442 is a wasteful number, since it uses less digits than its factorization.

1811668442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8794612.

The product of its digits is 73728, while the sum is 41.

The square root of 1811668442 is about 42563.6986409781. The cubic root of 1811668442 is about 1219.0632516306.

The spelling of 1811668442 in words is "one billion, eight hundred eleven million, six hundred sixty-eight thousand, four hundred forty-two".