19794138 has 48 divisors (see below), whose sum is σ = 49603680. Its totient is φ = 5219424.

The previous prime is 19794133. The next prime is 19794139. The reversal of 19794138 is 83149791.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 19794138.

It is not an unprimeable number, because it can be changed into a prime (19794133) 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 23 ways as a sum of consecutive naturals, for example, 1233 + ... + 6411.

It is an arithmetic number, because the mean of its divisors is an integer number (1033410).

Almost surely, 2^19794138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19794138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24801840).

19794138 is an abundant number, since it is smaller than the sum of its proper divisors (29809542).

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

19794138 is a wasteful number, since it uses less digits than its factorization.

19794138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5211 (or 5204 counting only the distinct ones).

The product of its digits is 54432, while the sum is 42.

The square root of 19794138 is about 4449.0603502313. The cubic root of 19794138 is about 270.5072221186.

The spelling of 19794138 in words is "nineteen million, seven hundred ninety-four thousand, one hundred thirty-eight".