19686868 has 6 divisors (see below), whose sum is σ = 34452026. Its totient is φ = 9843432.

The previous prime is 19686857. The next prime is 19686883. The reversal of 19686868 is 86868691.

It can be written as a sum of positive squares in only one way, i.e., 18818244 + 868624 = 4338^2 + 932^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2460855 + ... + 2460862.

Almost surely, 2^19686868 is an apocalyptic number.

It is an amenable number.

19686868 is a deficient number, since it is larger than the sum of its proper divisors (14765158).

19686868 is a wasteful number, since it uses less digits than its factorization.

19686868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4921721 (or 4921719 counting only the distinct ones).

The product of its digits is 995328, while the sum is 52.

The square root of 19686868 is about 4436.9886184213. The cubic root of 19686868 is about 270.0176851699.

It can be divided in two parts, 1968 and 6868, that added together give a square (8836 = 94²).

The spelling of 19686868 in words is "nineteen million, six hundred eighty-six thousand, eight hundred sixty-eight".