823445 has 12 divisors (see below), whose sum is σ = 1149804. Its totient is φ = 564480.

The previous prime is 823421. The next prime is 823447. The reversal of 823445 is 544328.

It can be written as a sum of positive squares in 2 ways, for example, as 461041 + 362404 = 679^2 + 602^2 .

It is not a de Polignac number, because 823445 - 2¹⁶ = 757909 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 7.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (823447) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1436 + ... + 1925.

It is an arithmetic number, because the mean of its divisors is an integer number (95817).

2⁸²³⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

823445 is a deficient number, since it is larger than the sum of its proper divisors (326359).

823445 is a wasteful number, since it uses less digits than its factorization.

823445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3380 (or 3373 counting only the distinct ones).

The product of its digits is 3840, while the sum is 26.

The square root of 823445 is about 907.4387031640. The cubic root of 823445 is about 93.7299097691.

The spelling of 823445 in words is "eight hundred twenty-three thousand, four hundred forty-five".