816040 has 32 divisors (see below), whose sum is σ = 1918080. Its totient is φ = 311872.

The previous prime is 816037. The next prime is 816043. The reversal of 816040 is 40618.

816040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (816037) and next prime (816043).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 815999 and 816017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 477 + ... + 1363.

It is an arithmetic number, because the mean of its divisors is an integer number (59940).

2⁸¹⁶⁰⁴⁰ 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 816040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (959040).

816040 is an abundant number, since it is smaller than the sum of its proper divisors (1102040).

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

816040 is a wasteful number, since it uses less digits than its factorization.

816040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921 (or 917 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 816040 is about 903.3493233517. The cubic root of 816040 is about 93.4481014470.

Adding to 816040 its reverse (40618), we get a palindrome (856658).

The spelling of 816040 in words is "eight hundred sixteen thousand, forty".