2019981816 has 48 divisors (see below), whose sum is σ = 5560481160. Its totient is φ = 662287680.

The previous prime is 2019981791. The next prime is 2019981829. The reversal of 2019981816 is 6181899102.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 225570 + ... + 234353.

Almost surely, 2^2019981816 is an apocalyptic number.

It is an amenable number.

2019981816 is an abundant number, since it is smaller than the sum of its proper divisors (3540499344).

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

2019981816 is a wasteful number, since it uses less digits than its factorization.

2019981816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459996 (or 459989 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 45.

The square root of 2019981816 is about 44944.2078136883. The cubic root of 2019981816 is about 1264.1030716969.

The spelling of 2019981816 in words is "two billion, nineteen million, nine hundred eighty-one thousand, eight hundred sixteen".