1998162433 has 4 divisors (see below), whose sum is σ = 1998251860. Its totient is φ = 1998073008.

The previous prime is 1998162427. The next prime is 1998162449. The reversal of 1998162433 is 3342618991.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3342618991 = 47 ⋅71119553.

It can be written as a sum of positive squares in 2 ways, for example, as 598878784 + 1399283649 = 24472^2 + 37407^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1998162433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1998162533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20791 + ... + 66547.

It is an arithmetic number, because the mean of its divisors is an integer number (499562965).

Almost surely, 2^1998162433 is an apocalyptic number.

It is an amenable number.

1998162433 is a deficient number, since it is larger than the sum of its proper divisors (89427).

1998162433 is an equidigital number, since it uses as much as digits as its factorization.

1998162433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89426.

The product of its digits is 279936, while the sum is 46.

The square root of 1998162433 is about 44700.8102051853. The cubic root of 1998162433 is about 1259.5350667684.

The spelling of 1998162433 in words is "one billion, nine hundred ninety-eight million, one hundred sixty-two thousand, four hundred thirty-three".