810004 has 24 divisors (see below), whose sum is σ = 1571528. Its totient is φ = 362880.

The previous prime is 809993. The next prime is 810013. The reversal of 810004 is 400018.

810004 = T₁₈₄ + T₁₈₅ + ... + T₂₂₂.

It can be written as a sum of positive squares in 4 ways, for example, as 3600 + 806404 = 60^2 + 898^2 .

It is a super-2 number, since 2×810004² = 1312212960032, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1714 + ... + 2134.

2⁸¹⁰⁰⁰⁴ is an apocalyptic number.

It is an amenable number.

810004 is a deficient number, since it is larger than the sum of its proper divisors (761524).

810004 is a wasteful number, since it uses less digits than its factorization.

810004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475 (or 473 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 810004 is about 900.0022222195. The cubic root of 810004 is about 93.2171286219.

The spelling of 810004 in words is "eight hundred ten thousand, four".