19990838 has 8 divisors (see below), whose sum is σ = 34270032. Its totient is φ = 8567496.

The previous prime is 19990811. The next prime is 19990849. The reversal of 19990838 is 83809991.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 19990792 and 19990801.

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, 713945 + ... + 713972.

It is an arithmetic number, because the mean of its divisors is an integer number (4283754).

Almost surely, 2^19990838 is an apocalyptic number.

19990838 is a deficient number, since it is larger than the sum of its proper divisors (14279194).

19990838 is a wasteful number, since it uses less digits than its factorization.

19990838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1427926.

The product of its (nonzero) digits is 139968, while the sum is 47.

The square root of 19990838 is about 4471.1114949194. Note that the first 3 decimals coincide. The cubic root of 19990838 is about 271.4003061716.

The spelling of 19990838 in words is "nineteen million, nine hundred ninety thousand, eight hundred thirty-eight".