19906798 has 4 divisors (see below), whose sum is σ = 29860200. Its totient is φ = 9953398.

The previous prime is 19906793. The next prime is 19906811. The reversal of 19906798 is 89760991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89760991 = 239 ⋅375569.

It is a super-2 number, since 2×19906798² = 792561213225608, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19906793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4976698 + ... + 4976701.

It is an arithmetic number, because the mean of its divisors is an integer number (7465050).

Almost surely, 2^19906798 is an apocalyptic number.

19906798 is a deficient number, since it is larger than the sum of its proper divisors (9953402).

19906798 is an equidigital number, since it uses as much as digits as its factorization.

19906798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9953401.

The product of its (nonzero) digits is 244944, while the sum is 49.

The square root of 19906798 is about 4461.7034863379. The cubic root of 19906798 is about 271.0194563992.

The spelling of 19906798 in words is "nineteen million, nine hundred six thousand, seven hundred ninety-eight".