19679864 has 16 divisors (see below), whose sum is σ = 38172600. Its totient is φ = 9500512.

The previous prime is 19679861. The next prime is 19679903. The reversal of 19679864 is 46897691.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19679861) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 42182 + ... + 42645.

Almost surely, 2^19679864 is an apocalyptic number.

It is an amenable number.

19679864 is a deficient number, since it is larger than the sum of its proper divisors (18492736).

19679864 is a wasteful number, since it uses less digits than its factorization.

19679864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84862 (or 84858 counting only the distinct ones).

The product of its digits is 653184, while the sum is 50.

The square root of 19679864 is about 4436.1992741535. The cubic root of 19679864 is about 269.9856599608.

The spelling of 19679864 in words is "nineteen million, six hundred seventy-nine thousand, eight hundred sixty-four".