19840838 has 4 divisors (see below), whose sum is σ = 29761260. Its totient is φ = 9920418.

The previous prime is 19840823. The next prime is 19840841. The reversal of 19840838 is 83804891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83804891 = 5903 ⋅14197.

It is a junction number, because it is equal to n+sod(n) for n = 19840795 and 19840804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4960208 + ... + 4960211.

It is an arithmetic number, because the mean of its divisors is an integer number (7440315).

Almost surely, 2^19840838 is an apocalyptic number.

19840838 is a deficient number, since it is larger than the sum of its proper divisors (9920422).

19840838 is an equidigital number, since it uses as much as digits as its factorization.

19840838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9920421.

The product of its (nonzero) digits is 55296, while the sum is 41.

The square root of 19840838 is about 4454.3055575477. The cubic root of 19840838 is about 270.7197895224.

The spelling of 19840838 in words is "nineteen million, eight hundred forty thousand, eight hundred thirty-eight".