1916381786 has 16 divisors (see below), whose sum is σ = 3161818368. Its totient is φ = 871081420.

The previous prime is 1916381767. The next prime is 1916381801. The reversal of 1916381786 is 6871836191.

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, 357290 + ... + 362613.

It is an arithmetic number, because the mean of its divisors is an integer number (197613648).

Almost surely, 2^1916381786 is an apocalyptic number.

1916381786 is a deficient number, since it is larger than the sum of its proper divisors (1245436582).

1916381786 is an equidigital number, since it uses as much as digits as its factorization.

1916381786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719938 (or 719916 counting only the distinct ones).

The product of its digits is 435456, while the sum is 50.

The square root of 1916381786 is about 43776.4981011501. The cubic root of 1916381786 is about 1242.1117730931. Note that the first 3 decimals are identical.

The spelling of 1916381786 in words is "one billion, nine hundred sixteen million, three hundred eighty-one thousand, seven hundred eighty-six".