19797798 has 8 divisors (see below), whose sum is σ = 39595608. Its totient is φ = 6599264.

The previous prime is 19797787. The next prime is 19797839. The reversal of 19797798 is 89779791.

It is a sphenic number, since it is the product of 3 distinct primes.

19797798 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1649811 + ... + 1649822.

It is an arithmetic number, because the mean of its divisors is an integer number (4949451).

Almost surely, 2^19797798 is an apocalyptic number.

19797798 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

19797798 is a wasteful number, since it uses less digits than its factorization.

19797798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3299638.

The product of its digits is 2000376, while the sum is 57.

The square root of 19797798 is about 4449.4716540281. The cubic root of 19797798 is about 270.5238936439.

The spelling of 19797798 in words is "nineteen million, seven hundred ninety-seven thousand, seven hundred ninety-eight".