19804038 has 16 divisors (see below), whose sum is σ = 39798336. Its totient is φ = 6569640.

The previous prime is 19804027. The next prime is 19804063. The reversal of 19804038 is 83040891.

It is a super-2 number, since 2×19804038² = 784399842210888, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6556 + ... + 9087.

It is an arithmetic number, because the mean of its divisors is an integer number (2487396).

Almost surely, 2^19804038 is an apocalyptic number.

19804038 is an abundant number, since it is smaller than the sum of its proper divisors (19994298).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19804038 is a wasteful number, since it uses less digits than its factorization.

19804038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15859.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 19804038 is about 4450.1728056335. The cubic root of 19804038 is about 270.5523124909.

Adding to 19804038 its sum of digits (33), we get a triangular number (19804071 = T₆₂₉₃).

The spelling of 19804038 in words is "nineteen million, eight hundred four thousand, thirty-eight".