1999935218 has 4 divisors (see below), whose sum is σ = 2999902830. Its totient is φ = 999967608.

The previous prime is 1999935191. The next prime is 1999935227. The reversal of 1999935218 is 8125399991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8125399991 = 263 ⋅30895057.

It can be written as a sum of positive squares in only one way, i.e., 1712056129 + 287879089 = 41377^2 + 16967^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499983803 + ... + 499983806.

Almost surely, 2^1999935218 is an apocalyptic number.

1999935218 is a deficient number, since it is larger than the sum of its proper divisors (999967612).

1999935218 is an equidigital number, since it uses as much as digits as its factorization.

1999935218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999967611.

The product of its digits is 1574640, while the sum is 56.

The square root of 1999935218 is about 44720.6352593520. The cubic root of 1999935218 is about 1259.9074463804.

The spelling of 1999935218 in words is "one billion, nine hundred ninety-nine million, nine hundred thirty-five thousand, two hundred eighteen".