19810002 has 16 divisors (see below), whose sum is σ = 39906720. Its totient is φ = 6555552.

The previous prime is 19810001. The next prime is 19810009. The reversal of 19810002 is 20001891.

It is not an unprimeable number, because it can be changed into a prime (19810001) 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, 11043 + ... + 12710.

It is an arithmetic number, because the mean of its divisors is an integer number (2494170).

Almost surely, 2^19810002 is an apocalyptic number.

19810002 is an abundant number, since it is smaller than the sum of its proper divisors (20096718).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19810002 is a wasteful number, since it uses less digits than its factorization.

19810002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23897.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 19810002 is about 4450.8428415301. The cubic root of 19810002 is about 270.5794687715.

Adding to 19810002 its reverse (20001891), we get a palindrome (39811893).

The spelling of 19810002 in words is "nineteen million, eight hundred ten thousand, two".