19713478 has 8 divisors (see below), whose sum is σ = 29786472. Its totient is φ = 9784656.

The previous prime is 19713451. The next prime is 19713487. The reversal of 19713478 is 87431791.

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

It is a self number, because there is not a number n which added to its sum of digits gives 19713478.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 35700 + ... + 36247.

It is an arithmetic number, because the mean of its divisors is an integer number (3723309).

Almost surely, 2^19713478 is an apocalyptic number.

19713478 is a deficient number, since it is larger than the sum of its proper divisors (10072994).

19713478 is a wasteful number, since it uses less digits than its factorization.

19713478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72086.

The product of its digits is 42336, while the sum is 40.

The square root of 19713478 is about 4439.9862612400. The cubic root of 19713478 is about 270.1392879852.

The spelling of 19713478 in words is "nineteen million, seven hundred thirteen thousand, four hundred seventy-eight".