19800838 has 8 divisors (see below), whose sum is σ = 30992688. Its totient is φ = 9469944.

The previous prime is 19800817. The next prime is 19800871. The reversal of 19800838 is 83800891.

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

It is a junction number, because it is equal to n+sod(n) for n = 19800797 and 19800806.

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, 215181 + ... + 215272.

It is an arithmetic number, because the mean of its divisors is an integer number (3874086).

Almost surely, 2^19800838 is an apocalyptic number.

19800838 is a deficient number, since it is larger than the sum of its proper divisors (11191850).

19800838 is a wasteful number, since it uses less digits than its factorization.

19800838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430478.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 19800838 is about 4449.8132545086. The cubic root of 19800838 is about 270.5377394690.

The spelling of 19800838 in words is "nineteen million, eight hundred thousand, eight hundred thirty-eight".