1998192813 has 16 divisors (see below), whose sum is σ = 2690492160. Its totient is φ = 1319060736.

The previous prime is 1998192811. The next prime is 1998192821. The reversal of 1998192813 is 3182918991.

It is not a de Polignac number, because 1998192813 - 2¹ = 1998192811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998192811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162156 + ... + 174042.

It is an arithmetic number, because the mean of its divisors is an integer number (168155760).

Almost surely, 2^1998192813 is an apocalyptic number.

It is an amenable number.

1998192813 is a deficient number, since it is larger than the sum of its proper divisors (692299347).

1998192813 is a wasteful number, since it uses less digits than its factorization.

1998192813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12436.

The product of its digits is 279936, while the sum is 51.

The square root of 1998192813 is about 44701.1500187635. The cubic root of 1998192813 is about 1259.5414500469.

The spelling of 1998192813 in words is "one billion, nine hundred ninety-eight million, one hundred ninety-two thousand, eight hundred thirteen".