840553 has 4 divisors (see below), whose sum is σ = 960640. Its totient is φ = 720468.

The previous prime is 840547. The next prime is 840557. The reversal of 840553 is 355048.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 840553 - 2¹³ = 832361 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (840557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60033 + ... + 60046.

It is an arithmetic number, because the mean of its divisors is an integer number (240160).

2⁸⁴⁰⁵⁵³ is an apocalyptic number.

It is an amenable number.

840553 is a deficient number, since it is larger than the sum of its proper divisors (120087).

840553 is a wasteful number, since it uses less digits than its factorization.

840553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120086.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 840553 is about 916.8167755882. The cubic root of 840553 is about 94.3745804990.

The spelling of 840553 in words is "eight hundred forty thousand, five hundred fifty-three".