816340 has 60 divisors (see below), whose sum is σ = 2117556. Its totient is φ = 263424.

The previous prime is 816329. The next prime is 816341. The reversal of 816340 is 43618.

816340 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 470596 + 345744 = 686^2 + 588^2 .

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 7.

It is a zygodrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816341) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 48012 + ... + 48028.

2⁸¹⁶³⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 816340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1058778).

816340 is an abundant number, since it is smaller than the sum of its proper divisors (1301216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

816340 is a wasteful number, since it uses less digits than its factorization.

816340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54 (or 31 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 816340 is about 903.5153568147. The cubic root of 816340 is about 93.4595514558.

Adding to 816340 its reverse (43618), we get a palindrome (859958).

It can be divided in two parts, 816 and 340, that added together give a square (1156 = 34²).

The spelling of 816340 in words is "eight hundred sixteen thousand, three hundred forty".