19699998 has 16 divisors (see below), whose sum is σ = 41473920. Its totient is φ = 6221016.

The previous prime is 19699997. The next prime is 19700027. The reversal of 19699998 is 89999691.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19699997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86290 + ... + 86517.

It is an arithmetic number, because the mean of its divisors is an integer number (2592120).

Almost surely, 2^19699998 is an apocalyptic number.

19699998 is an abundant number, since it is smaller than the sum of its proper divisors (21773922).

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

19699998 is a wasteful number, since it uses less digits than its factorization.

19699998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172831.

The product of its digits is 2834352, while the sum is 60.

The square root of 19699998 is about 4438.4679789315. The cubic root of 19699998 is about 270.0777005453.

The spelling of 19699998 in words is "nineteen million, six hundred ninety-nine thousand, nine hundred ninety-eight".