19686404 has 6 divisors (see below), whose sum is σ = 34451214. Its totient is φ = 9843200.

The previous prime is 19686379. The next prime is 19686419. The reversal of 19686404 is 40468691.

It can be written as a sum of positive squares in only one way, i.e., 19624900 + 61504 = 4430^2 + 248^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2460797 + ... + 2460804.

It is an arithmetic number, because the mean of its divisors is an integer number (5741869).

Almost surely, 2^19686404 is an apocalyptic number.

It is an amenable number.

19686404 is a deficient number, since it is larger than the sum of its proper divisors (14764810).

19686404 is a wasteful number, since it uses less digits than its factorization.

19686404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4921605 (or 4921603 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 19686404 is about 4436.9363303974. The cubic root of 19686404 is about 270.0155638033.

The spelling of 19686404 in words is "nineteen million, six hundred eighty-six thousand, four hundred four".