831385 has 8 divisors (see below), whose sum is σ = 1056456. Its totient is φ = 625920.

The previous prime is 831373. The next prime is 831407. The reversal of 831385 is 583138.

It can be written as a sum of positive squares in 4 ways, for example, as 147456 + 683929 = 384^2 + 827^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 831385 - 2⁹ = 830873 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4806 + ... + 4975.

It is an arithmetic number, because the mean of its divisors is an integer number (132057).

2⁸³¹³⁸⁵ is an apocalyptic number.

831385 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

831385 is a deficient number, since it is larger than the sum of its proper divisors (225071).

831385 is a wasteful number, since it uses less digits than its factorization.

831385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9803.

The product of its digits is 2880, while the sum is 28.

The square root of 831385 is about 911.8031585819. The cubic root of 831385 is about 94.0302075844.

The spelling of 831385 in words is "eight hundred thirty-one thousand, three hundred eighty-five".