19797986 has 16 divisors (see below), whose sum is σ = 33372864. Its totient is φ = 8739984.

The previous prime is 19797983. The next prime is 19797989. The reversal of 19797986 is 68979791.

It is an interprime number because it is at equal distance from previous prime (19797983) and next prime (19797989).

It is not an unprimeable number, because it can be changed into a prime (19797983) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 15956 + ... + 17151.

It is an arithmetic number, because the mean of its divisors is an integer number (2085804).

Almost surely, 2^19797986 is an apocalyptic number.

19797986 is a deficient number, since it is larger than the sum of its proper divisors (13574878).

19797986 is a wasteful number, since it uses less digits than its factorization.

19797986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33145.

The product of its digits is 1714608, while the sum is 56.

The square root of 19797986 is about 4449.4927800818. The cubic root of 19797986 is about 270.5247499400.

The spelling of 19797986 in words is "nineteen million, seven hundred ninety-seven thousand, nine hundred eighty-six".