19806002 has 4 divisors (see below), whose sum is σ = 29709006. Its totient is φ = 9903000.

The previous prime is 19806001. The next prime is 19806049. The reversal of 19806002 is 20060891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19722481 + 83521 = 4441^2 + 289^2 .

It is not an unprimeable number, because it can be changed into a prime (19806001) 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 as a sum of consecutive naturals, namely, 4951499 + ... + 4951502.

Almost surely, 2^19806002 is an apocalyptic number.

19806002 is a deficient number, since it is larger than the sum of its proper divisors (9903004).

19806002 is an equidigital number, since it uses as much as digits as its factorization.

19806002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9903003.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 19806002 is about 4450.3934657511. The cubic root of 19806002 is about 270.5612559056.

Adding to 19806002 its reverse (20060891), we get a palindrome (39866893).

The spelling of 19806002 in words is "nineteen million, eight hundred six thousand, two".