1916419986 has 64 divisors (see below), whose sum is σ = 4643063040. Its totient is φ = 589650192.

The previous prime is 1916419931. The next prime is 1916419993. The reversal of 1916419986 is 6899146191.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

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 31 ways as a sum of consecutive naturals, for example, 40011 + ... + 73713.

It is an arithmetic number, because the mean of its divisors is an integer number (72547860).

Almost surely, 2^1916419986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1916419986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2321531520).

1916419986 is an abundant number, since it is smaller than the sum of its proper divisors (2726643054).

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

1916419986 is an equidigital number, since it uses as much as digits as its factorization.

1916419986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33739 (or 33721 counting only the distinct ones).

The product of its digits is 839808, while the sum is 54.

The square root of 1916419986 is about 43776.9344061459. The cubic root of 1916419986 is about 1242.1200262075.

The spelling of 1916419986 in words is "one billion, nine hundred sixteen million, four hundred nineteen thousand, nine hundred eighty-six".