19804338 has 40 divisors (see below), whose sum is σ = 45424368. Its totient is φ = 6445656.

The previous prime is 19804307. The next prime is 19804339. The reversal of 19804338 is 83340891.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19804339) 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 19 ways as a sum of consecutive naturals, for example, 5545 + ... + 8387.

Almost surely, 2^19804338 is an apocalyptic number.

19804338 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19804338, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22712184).

19804338 is an abundant number, since it is smaller than the sum of its proper divisors (25620030).

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

19804338 is a wasteful number, since it uses less digits than its factorization.

19804338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2900 (or 2891 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 19804338 is about 4450.2065120621. The cubic root of 19804338 is about 270.5536786312.

It can be divided in two parts, 19 and 804338, that added together give a cube (804357 = 93³).

The spelling of 19804338 in words is "nineteen million, eight hundred four thousand, three hundred thirty-eight".