19997298 has 36 divisors (see below), whose sum is σ = 44907018. Its totient is φ = 6431040.

The previous prime is 19997297. The next prime is 19997317. The reversal of 19997298 is 89279991.

It can be written as a sum of positive squares in 3 ways, for example, as 19740249 + 257049 = 4443^2 + 507^2 .

It is not an unprimeable number, because it can be changed into a prime (19997297) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 14478 + ... + 15798.

Almost surely, 2^19997298 is an apocalyptic number.

19997298 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19997298, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22453509).

19997298 is an abundant number, since it is smaller than the sum of its proper divisors (24909720).

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

19997298 is a wasteful number, since it uses less digits than its factorization.

19997298 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1387 (or 1355 counting only the distinct ones).

The product of its digits is 734832, while the sum is 54.

The square root of 19997298 is about 4471.8338520119. The cubic root of 19997298 is about 271.4295371816.

The spelling of 19997298 in words is "nineteen million, nine hundred ninety-seven thousand, two hundred ninety-eight".