1998731119 has 36 divisors (see below), whose sum is σ = 2666935152. Its totient is φ = 1489635840.

The previous prime is 1998731113. The next prime is 1998731129. The reversal of 1998731119 is 9111378991.

1998731119 = 302² + 303² + ... + 1819².

It is a de Polignac number, because none of the positive numbers 2^k-1998731119 is a prime.

It is a super-2 number, since 2×1998731119² = 7989852172117984322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

1998731119 is a modest number, since divided by 31119 gives 19987 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998731113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 129039 + ... + 143695.

It is an arithmetic number, because the mean of its divisors is an integer number (74081532).

Almost surely, 2^1998731119 is an apocalyptic number.

1998731119 is a deficient number, since it is larger than the sum of its proper divisors (668204033).

1998731119 is a wasteful number, since it uses less digits than its factorization.

1998731119 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14716 (or 14698 counting only the distinct ones).

The product of its digits is 122472, while the sum is 49.

The square root of 1998731119 is about 44707.1707782991. The cubic root of 1998731119 is about 1259.6545452129.

The spelling of 1998731119 in words is "one billion, nine hundred ninety-eight million, seven hundred thirty-one thousand, one hundred nineteen".