19686494 has 8 divisors (see below), whose sum is σ = 29934480. Its totient is φ = 9708336.

The previous prime is 19686487. The next prime is 19686497. The reversal of 19686494 is 49468691.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19686497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67274 + ... + 67565.

It is an arithmetic number, because the mean of its divisors is an integer number (3741810).

Almost surely, 2^19686494 is an apocalyptic number.

19686494 is a deficient number, since it is larger than the sum of its proper divisors (10247986).

19686494 is a wasteful number, since it uses less digits than its factorization.

19686494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134914.

The product of its digits is 373248, while the sum is 47.

The square root of 19686494 is about 4436.9464725191. The cubic root of 19686494 is about 270.0159752779.

The spelling of 19686494 in words is "nineteen million, six hundred eighty-six thousand, four hundred ninety-four".