19804938 has 8 divisors (see below), whose sum is σ = 39609888. Its totient is φ = 6601644.

The previous prime is 19804937. The next prime is 19804969. The reversal of 19804938 is 83940891.

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

19804938 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 19804938.

It is not an unprimeable number, because it can be changed into a prime (19804933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1650406 + ... + 1650417.

It is an arithmetic number, because the mean of its divisors is an integer number (4951236).

Almost surely, 2^19804938 is an apocalyptic number.

19804938 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.

19804938 is a wasteful number, since it uses less digits than its factorization.

19804938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3300828.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 19804938 is about 4450.2739241534. The cubic root of 19804938 is about 270.5564108704.

The spelling of 19804938 in words is "nineteen million, eight hundred four thousand, nine hundred thirty-eight".