19688394 has 48 divisors (see below), whose sum is σ = 44279424. Its totient is φ = 5829120.

The previous prime is 19688393. The next prime is 19688399. The reversal of 19688394 is 49388691.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19688393) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 33834 + ... + 34410.

It is an arithmetic number, because the mean of its divisors is an integer number (922488).

Almost surely, 2^19688394 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19688394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22139712).

19688394 is an abundant number, since it is smaller than the sum of its proper divisors (24591030).

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

19688394 is a wasteful number, since it uses less digits than its factorization.

19688394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651 (or 640 counting only the distinct ones).

The product of its digits is 373248, while the sum is 48.

The square root of 19688394 is about 4437.1605785682. The cubic root of 19688394 is about 270.0246616705.

The spelling of 19688394 in words is "nineteen million, six hundred eighty-eight thousand, three hundred ninety-four".