840545 has 4 divisors (see below), whose sum is σ = 1008660. Its totient is φ = 672432.

The previous prime is 840523. The next prime is 840547. The reversal of 840545 is 545048.

840545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 667489 + 173056 = 817^2 + 416^2 .

It is a cyclic number.

It is not a de Polignac number, because 840545 - 2⁸ = 840289 is a prime.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 840545.

It is not an unprimeable number, because it can be changed into a prime (840547) 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, 84050 + ... + 84059.

It is an arithmetic number, because the mean of its divisors is an integer number (252165).

2⁸⁴⁰⁵⁴⁵ is an apocalyptic number.

It is an amenable number.

840545 is a deficient number, since it is larger than the sum of its proper divisors (168115).

840545 is a wasteful number, since it uses less digits than its factorization.

840545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168114.

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 840545 is about 916.8124126559. The cubic root of 840545 is about 94.3742810933.

It can be divided in two parts, 8405 and 45, that multiplied together give a square (378225 = 615²).

The spelling of 840545 in words is "eight hundred forty thousand, five hundred forty-five".