844540 has 12 divisors (see below), whose sum is σ = 1773576. Its totient is φ = 337808.

The previous prime is 844523. The next prime is 844549. The reversal of 844540 is 45448.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (844549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21094 + ... + 21133.

It is an arithmetic number, because the mean of its divisors is an integer number (147798).

2⁸⁴⁴⁵⁴⁰ is an apocalyptic number.

It is an amenable number.

844540 is an abundant number, since it is smaller than the sum of its proper divisors (929036).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

844540 is a wasteful number, since it uses less digits than its factorization.

844540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42236 (or 42234 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 25.

The square root of 844540 is about 918.9885744665. The cubic root of 844540 is about 94.5235610280.

Adding to 844540 its reverse (45448), we get a palindrome (889988).

It can be divided in two parts, 84 and 4540, that added together give a square (4624 = 68²).

The spelling of 844540 in words is "eight hundred forty-four thousand, five hundred forty".