818434 has 4 divisors (see below), whose sum is σ = 1227654. Its totient is φ = 409216.

The previous prime is 818429. The next prime is 818453. The reversal of 818434 is 434818.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 434818 = 2 ⋅217409.

It can be written as a sum of positive squares in only one way, i.e., 815409 + 3025 = 903^2 + 55^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204607 + ... + 204610.

2⁸¹⁸⁴³⁴ is an apocalyptic number.

818434 is a deficient number, since it is larger than the sum of its proper divisors (409220).

818434 is a wasteful number, since it uses less digits than its factorization.

818434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409219.

The product of its digits is 3072, while the sum is 28.

The square root of 818434 is about 904.6734217385. The cubic root of 818434 is about 93.5393944970.

It can be divided in two parts, 81 and 8434, that added together give a triangular number (8515 = T₁₃₀).

The spelling of 818434 in words is "eight hundred eighteen thousand, four hundred thirty-four".