19668378 has 8 divisors (see below), whose sum is σ = 39336768. Its totient is φ = 6556124.

The previous prime is 19668359. The next prime is 19668391. The reversal of 19668378 is 87386691.

It is a sphenic number, since it is the product of 3 distinct primes.

19668378 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1639026 + ... + 1639037.

It is an arithmetic number, because the mean of its divisors is an integer number (4917096).

Almost surely, 2^19668378 is an apocalyptic number.

19668378 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

19668378 is a wasteful number, since it uses less digits than its factorization.

19668378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3278068.

The product of its digits is 435456, while the sum is 48.

The square root of 19668378 is about 4434.9045085548. The cubic root of 19668378 is about 269.9331247267.

The spelling of 19668378 in words is "nineteen million, six hundred sixty-eight thousand, three hundred seventy-eight".