19998434 has 4 divisors (see below), whose sum is σ = 29997654. Its totient is φ = 9999216.

The previous prime is 19998427. The next prime is 19998479. The reversal of 19998434 is 43489991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17098225 + 2900209 = 4135^2 + 1703^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999607 + ... + 4999610.

Almost surely, 2^19998434 is an apocalyptic number.

19998434 is a deficient number, since it is larger than the sum of its proper divisors (9999220).

19998434 is an equidigital number, since it uses as much as digits as its factorization.

19998434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9999219.

The product of its digits is 279936, while the sum is 47.

The square root of 19998434 is about 4471.9608674495. The cubic root of 19998434 is about 271.4346768446.

The spelling of 19998434 in words is "nineteen million, nine hundred ninety-eight thousand, four hundred thirty-four".