19998534 has 32 divisors (see below), whose sum is σ = 41840640. Its totient is φ = 6364800.

The previous prime is 19998533. The next prime is 19998541. The reversal of 19998534 is 43589991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19998533) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 14014 + ... + 15374.

It is an arithmetic number, because the mean of its divisors is an integer number (1307520).

Almost surely, 2^19998534 is an apocalyptic number.

19998534 is an abundant number, since it is smaller than the sum of its proper divisors (21842106).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19998534 is a wasteful number, since it uses less digits than its factorization.

19998534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1476.

The product of its digits is 349920, while the sum is 48.

The square root of 19998534 is about 4471.9720482132. The cubic root of 19998534 is about 271.4351292704.

The spelling of 19998534 in words is "nineteen million, nine hundred ninety-eight thousand, five hundred thirty-four".