19986734 has 16 divisors (see below), whose sum is σ = 30997968. Its totient is φ = 9657792.

The previous prime is 19986731. The next prime is 19986737. The reversal of 19986734 is 43768991.

It is an interprime number because it is at equal distance from previous prime (19986731) and next prime (19986737).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19986731) 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, 11234 + ... + 12890.

It is an arithmetic number, because the mean of its divisors is an integer number (1937373).

Almost surely, 2^19986734 is an apocalyptic number.

19986734 is a deficient number, since it is larger than the sum of its proper divisors (11011234).

19986734 is a wasteful number, since it uses less digits than its factorization.

19986734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1859.

The product of its digits is 326592, while the sum is 47.

The square root of 19986734 is about 4470.6525250795. The cubic root of 19986734 is about 271.3817326116.

The spelling of 19986734 in words is "nineteen million, nine hundred eighty-six thousand, seven hundred thirty-four".