1916819720 has 16 divisors (see below), whose sum is σ = 4312844460. Its totient is φ = 766727872.

The previous prime is 1916819719. The next prime is 1916819797. The reversal of 1916819720 is 279186191.

It can be written as a sum of positive squares in 2 ways, for example, as 1817657956 + 99161764 = 42634^2 + 9958^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23960207 + ... + 23960286.

Almost surely, 2^1916819720 is an apocalyptic number.

1916819720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1916819720 is an abundant number, since it is smaller than the sum of its proper divisors (2396024740).

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

1916819720 is a wasteful number, since it uses less digits than its factorization.

1916819720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47920504 (or 47920500 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 44.

The square root of 1916819720 is about 43781.4997458972. The cubic root of 1916819720 is about 1242.2063822068.

The spelling of 1916819720 in words is "one billion, nine hundred sixteen million, eight hundred nineteen thousand, seven hundred twenty".