816385 has 16 divisors (see below), whose sum is σ = 1059840. Its totient is φ = 601920.

The previous prime is 816377. The next prime is 816401. The reversal of 816385 is 583618.

It is not a de Polignac number, because 816385 - 2³ = 816377 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

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

Its product of digits (5760) is a multiple of the sum of its prime divisors (288).

It is a plaindrome in base 13.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3451 + ... + 3679.

It is an arithmetic number, because the mean of its divisors is an integer number (66240).

2⁸¹⁶³⁸⁵ is an apocalyptic number.

It is an amenable number.

816385 is a deficient number, since it is larger than the sum of its proper divisors (243455).

816385 is a wasteful number, since it uses less digits than its factorization.

816385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288.

The product of its digits is 5760, while the sum is 31.

The square root of 816385 is about 903.5402592027. The cubic root of 816385 is about 93.4612687152.

816385 divided by its sum of digits (31) gives a triangular number (26335 = T₂₂₉).

The spelling of 816385 in words is "eight hundred sixteen thousand, three hundred eighty-five".