810002 has 4 divisors (see below), whose sum is σ = 1215006. Its totient is φ = 405000.

The previous prime is 809993. The next prime is 810013. The reversal of 810002 is 200018.

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., 561001 + 249001 = 749^2 + 499^2 .

It is a super-2 number, since 2×810002² = 1312206480008, which contains 22 as substring.

It is a plaindrome in base 13.

It is an unprimeable number.

810002 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202499 + ... + 202502.

2⁸¹⁰⁰⁰² is an apocalyptic number.

810002 is a deficient number, since it is larger than the sum of its proper divisors (405004).

810002 is a wasteful number, since it uses less digits than its factorization.

810002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405003.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 810002 is about 900.0011111104. The cubic root of 810002 is about 93.2170519003.

Adding to 810002 its product of nonzero digits (16), we get a palindrome (810018).

The spelling of 810002 in words is "eight hundred ten thousand, two".