810001004 has 12 divisors (see below), whose sum is σ = 1418487504. Its totient is φ = 404718864.

The previous prime is 810000977. The next prime is 810001007. The reversal of 810001004 is 400100018.

It is a happy number.

It is a super-2 number, since 2×810001004² = 1312203252962016032, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 810001004.

It is not an unprimeable number, because it can be changed into a prime (810001007) 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 3 ways as a sum of consecutive naturals, for example, 63872 + ... + 75495.

It is an arithmetic number, because the mean of its divisors is an integer number (118207292).

Almost surely, 2^810001004 is an apocalyptic number.

It is an amenable number.

810001004 is a deficient number, since it is larger than the sum of its proper divisors (608486500).

810001004 is a wasteful number, since it uses less digits than its factorization.

810001004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140824 (or 140822 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 810001004 is about 28460.5165799920. The cubic root of 810001004 is about 932.1701369294.

The spelling of 810001004 in words is "eight hundred ten million, one thousand, four".