19678438 has 16 divisors (see below), whose sum is σ = 31888080. Its totient is φ = 9053856.

The previous prime is 19678429. The next prime is 19678457. The reversal of 19678438 is 83487691.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 8856 + ... + 10852.

It is an arithmetic number, because the mean of its divisors is an integer number (1993005).

Almost surely, 2^19678438 is an apocalyptic number.

19678438 is a deficient number, since it is larger than the sum of its proper divisors (12209642).

19678438 is a wasteful number, since it uses less digits than its factorization.

19678438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2391.

The product of its digits is 290304, while the sum is 46.

The square root of 19678438 is about 4436.0385480742. The cubic root of 19678438 is about 269.9791387632.

The spelling of 19678438 in words is "nineteen million, six hundred seventy-eight thousand, four hundred thirty-eight".