842445 has 24 divisors (see below), whose sum is σ = 1482936. Its totient is φ = 442368.

The previous prime is 842423. The next prime is 842447. The reversal of 842445 is 544248.

It can be written as a sum of positive squares in 4 ways, for example, as 21609 + 820836 = 147^2 + 906^2 .

It is not a de Polignac number, because 842445 - 2⁹ = 841933 is a prime.

842445 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (842447) 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, 4269 + ... + 4461.

It is an arithmetic number, because the mean of its divisors is an integer number (61789).

2⁸⁴²⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

842445 is a deficient number, since it is larger than the sum of its proper divisors (640491).

842445 is a wasteful number, since it uses less digits than its factorization.

842445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301 (or 298 counting only the distinct ones).

The product of its digits is 5120, while the sum is 27.

The square root of 842445 is about 917.8480266362. The cubic root of 842445 is about 94.4453366570.

The spelling of 842445 in words is "eight hundred forty-two thousand, four hundred forty-five".