816463 has 4 divisors (see below), whose sum is σ = 821520. Its totient is φ = 811408.

The previous prime is 816451. The next prime is 816469. The reversal of 816463 is 364618.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 364618 = 2 ⋅182309.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-816463 is a prime.

It is a super-2 number, since 2×816463² = 1333223660738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816469) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2278 + ... + 2611.

It is an arithmetic number, because the mean of its divisors is an integer number (205380).

2⁸¹⁶⁴⁶³ is an apocalyptic number.

816463 is a deficient number, since it is larger than the sum of its proper divisors (5057).

816463 is a wasteful number, since it uses less digits than its factorization.

816463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5056.

The product of its digits is 3456, while the sum is 28.

The square root of 816463 is about 903.5834217160. The cubic root of 816463 is about 93.4642451486.

It can be divided in two parts, 8 and 16463, that added together give a triangular number (16471 = T₁₈₁).

The spelling of 816463 in words is "eight hundred sixteen thousand, four hundred sixty-three".