19986394 has 16 divisors (see below), whose sum is σ = 31120200. Its totient is φ = 9615424.

The previous prime is 19986389. The next prime is 19986397. The reversal of 19986394 is 49368991.

It can be written as a sum of positive squares in 4 ways, for example, as 19580625 + 405769 = 4425^2 + 637^2 .

It is not an unprimeable number, because it can be changed into a prime (19986397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29184 + ... + 29860.

Almost surely, 2^19986394 is an apocalyptic number.

19986394 is a deficient number, since it is larger than the sum of its proper divisors (11133806).

19986394 is a wasteful number, since it uses less digits than its factorization.

19986394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1217.

The product of its digits is 419904, while the sum is 49.

The square root of 19986394 is about 4470.6144991489. The cubic root of 19986394 is about 271.3801937523.

The spelling of 19986394 in words is "nineteen million, nine hundred eighty-six thousand, three hundred ninety-four".