1998267345 has 12 divisors (see below), whose sum is σ = 3463663476. Its totient is φ = 1065742560.

The previous prime is 1998267311. The next prime is 1998267361. The reversal of 1998267345 is 5437628991.

It can be written as a sum of positive squares in 2 ways, for example, as 1203534864 + 794732481 = 34692^2 + 28191^2 .

It is not a de Polignac number, because 1998267345 - 2¹⁵ = 1998234577 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1998267291 and 1998267300.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22202926 + ... + 22203015.

It is an arithmetic number, because the mean of its divisors is an integer number (288638623).

Almost surely, 2^1998267345 is an apocalyptic number.

1998267345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1998267345 is a deficient number, since it is larger than the sum of its proper divisors (1465396131).

1998267345 is a wasteful number, since it uses less digits than its factorization.

1998267345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44405952 (or 44405949 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The square root of 1998267345 is about 44701.9836808167. The cubic root of 1998267345 is about 1259.5571100265.

The spelling of 1998267345 in words is "one billion, nine hundred ninety-eight million, two hundred sixty-seven thousand, three hundred forty-five".