19794638 has 4 divisors (see below), whose sum is σ = 29691960. Its totient is φ = 9897318.

The previous prime is 19794629. The next prime is 19794641. The reversal of 19794638 is 83649791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83649791 = 809 ⋅103399.

It is a junction number, because it is equal to n+sod(n) for n = 19794592 and 19794601.

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, 4948658 + ... + 4948661.

It is an arithmetic number, because the mean of its divisors is an integer number (7422990).

Almost surely, 2^19794638 is an apocalyptic number.

19794638 is a deficient number, since it is larger than the sum of its proper divisors (9897322).

19794638 is an equidigital number, since it uses as much as digits as its factorization.

19794638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9897321.

The product of its digits is 326592, while the sum is 47.

The square root of 19794638 is about 4449.1165415170. The cubic root of 19794638 is about 270.5094997706.

The spelling of 19794638 in words is "nineteen million, seven hundred ninety-four thousand, six hundred thirty-eight".