1998119444 has 6 divisors (see below), whose sum is σ = 3496709034. Its totient is φ = 999059720.

The previous prime is 1998119443. The next prime is 1998119447. The reversal of 1998119444 is 4449118991.

It can be written as a sum of positive squares in only one way, i.e., 1811523844 + 186595600 = 42562^2 + 13660^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1998119392 and 1998119401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998119441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249764927 + ... + 249764934.

It is an arithmetic number, because the mean of its divisors is an integer number (582784839).

Almost surely, 2^1998119444 is an apocalyptic number.

It is an amenable number.

1998119444 is a deficient number, since it is larger than the sum of its proper divisors (1498589590).

1998119444 is a wasteful number, since it uses less digits than its factorization.

1998119444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499529865 (or 499529863 counting only the distinct ones).

The product of its digits is 373248, while the sum is 50.

The square root of 1998119444 is about 44700.3293500171. The cubic root of 1998119444 is about 1259.5260340458.

The spelling of 1998119444 in words is "one billion, nine hundred ninety-eight million, one hundred nineteen thousand, four hundred forty-four".