816387 has 24 divisors (see below), whose sum is σ = 1295952. Its totient is φ = 454080.

The previous prime is 816377. The next prime is 816401. The reversal of 816387 is 783618.

It is not a de Polignac number, because 816387 - 2⁸ = 816131 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (816317) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4633 + ... + 4805.

It is an arithmetic number, because the mean of its divisors is an integer number (53998).

2⁸¹⁶³⁸⁷ is an apocalyptic number.

816387 is a deficient number, since it is larger than the sum of its proper divisors (479565).

816387 is a wasteful number, since it uses less digits than its factorization.

816387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211 (or 200 counting only the distinct ones).

The product of its digits is 8064, while the sum is 33.

The square root of 816387 is about 903.5413659595. The cubic root of 816387 is about 93.4613450364.

The spelling of 816387 in words is "eight hundred sixteen thousand, three hundred eighty-seven".