19986746 has 16 divisors (see below), whose sum is σ = 33986400. Its totient is φ = 8738928.

The previous prime is 19986739. The next prime is 19986749. The reversal of 19986746 is 64768991.

It is a junction number, because it is equal to n+sod(n) for n = 19986694 and 19986703.

It is not an unprimeable number, because it can be changed into a prime (19986749) 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, 19736 + ... + 20723.

It is an arithmetic number, because the mean of its divisors is an integer number (2124150).

Almost surely, 2^19986746 is an apocalyptic number.

19986746 is a deficient number, since it is larger than the sum of its proper divisors (13999654).

19986746 is a wasteful number, since it uses less digits than its factorization.

19986746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40493.

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

The square root of 19986746 is about 4470.6538671653. The cubic root of 19986746 is about 271.3817869240.

The spelling of 19986746 in words is "nineteen million, nine hundred eighty-six thousand, seven hundred forty-six".