1999196718 has 16 divisors (see below), whose sum is σ = 4016010240. Its totient is φ = 663462776.

The previous prime is 1999196711. The next prime is 1999196723. The reversal of 1999196718 is 8176919991.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999196711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 732558 + ... + 735281.

It is an arithmetic number, because the mean of its divisors is an integer number (251000640).

Almost surely, 2^1999196718 is an apocalyptic number.

1999196718 is an abundant number, since it is smaller than the sum of its proper divisors (2016813522).

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

1999196718 is a wasteful number, since it uses less digits than its factorization.

1999196718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1468071.

The product of its digits is 2204496, while the sum is 60.

The square root of 1999196718 is about 44712.3776822481. The cubic root of 1999196718 is about 1259.7523486569.

The spelling of 1999196718 in words is "one billion, nine hundred ninety-nine million, one hundred ninety-six thousand, seven hundred eighteen".