1917808842 has 16 divisors (see below), whose sum is σ = 3888161280. Its totient is φ = 630512352.

The previous prime is 1917808817. The next prime is 1917808877. The reversal of 1917808842 is 2488087191.

It is a junction number, because it is equal to n+sod(n) for n = 1917808791 and 1917808800.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2188842 + ... + 2189717.

It is an arithmetic number, because the mean of its divisors is an integer number (243010080).

Almost surely, 2^1917808842 is an apocalyptic number.

1917808842 is an abundant number, since it is smaller than the sum of its proper divisors (1970352438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1917808842 is a wasteful number, since it uses less digits than its factorization.

1917808842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4378637.

The product of its (nonzero) digits is 258048, while the sum is 48.

The square root of 1917808842 is about 43792.7944072995. The cubic root of 1917808842 is about 1242.4200142565.

The spelling of 1917808842 in words is "one billion, nine hundred seventeen million, eight hundred eight thousand, eight hundred forty-two".