652821 has 16 divisors (see below), whose sum is σ = 987840. Its totient is φ = 380160.

The previous prime is 652811. The next prime is 652831. The reversal of 652821 is 128256.

It is an interprime number because it is at equal distance from previous prime (652811) and next prime (652831).

It is not a de Polignac number, because 652821 - 2¹³ = 644629 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 652791 and 652800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (652811) 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 15 ways as a sum of consecutive naturals, for example, 301 + ... + 1181.

It is an arithmetic number, because the mean of its divisors is an integer number (61740).

2⁶⁵²⁸²¹ is an apocalyptic number.

It is an amenable number.

652821 is a deficient number, since it is larger than the sum of its proper divisors (335019).

652821 is a wasteful number, since it uses less digits than its factorization.

652821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 916.

The product of its digits is 960, while the sum is 24.

The square root of 652821 is about 807.9733906510. The cubic root of 652821 is about 86.7490456035.

The spelling of 652821 in words is "six hundred fifty-two thousand, eight hundred twenty-one".