825391 has 8 divisors (see below), whose sum is σ = 959264. Its totient is φ = 695520.

The previous prime is 825389. The next prime is 825397. The reversal of 825391 is 193528.

825391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 825391 - 2¹ = 825389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (825397) 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, 540 + ... + 1393.

It is an arithmetic number, because the mean of its divisors is an integer number (119908).

2⁸²⁵³⁹¹ is an apocalyptic number.

825391 is a deficient number, since it is larger than the sum of its proper divisors (133873).

825391 is a wasteful number, since it uses less digits than its factorization.

825391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2001.

The product of its digits is 2160, while the sum is 28.

The square root of 825391 is about 908.5103191489. The cubic root of 825391 is about 93.8036871754.

The spelling of 825391 in words is "eight hundred twenty-five thousand, three hundred ninety-one".