1998467189 has 4 divisors (see below), whose sum is σ = 2008930560. Its totient is φ = 1988003820.

The previous prime is 1998467167. The next prime is 1998467197. The reversal of 1998467189 is 9817648991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1998467189 - 2²⁰ = 1997418613 is a prime.

It is a super-2 number, since 2×1998467189² = 7987742211019123442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998467689) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5231399 + ... + 5231780.

It is an arithmetic number, because the mean of its divisors is an integer number (502232640).

Almost surely, 2^1998467189 is an apocalyptic number.

It is an amenable number.

1998467189 is a deficient number, since it is larger than the sum of its proper divisors (10463371).

1998467189 is a wasteful number, since it uses less digits than its factorization.

1998467189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10463370.

The product of its digits is 7838208, while the sum is 62.

The square root of 1998467189 is about 44704.2189172342. The cubic root of 1998467189 is about 1259.5990974914.

The spelling of 1998467189 in words is "one billion, nine hundred ninety-eight million, four hundred sixty-seven thousand, one hundred eighty-nine".