653812 has 12 divisors (see below), whose sum is σ = 1152900. Its totient is φ = 324416.

The previous prime is 653801. The next prime is 653819. The reversal of 653812 is 218356.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 126736 + 527076 = 356^2 + 726^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (653819) by changing a digit.

653812 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48 + ... + 1144.

It is an arithmetic number, because the mean of its divisors is an integer number (96075).

2⁶⁵³⁸¹² is an apocalyptic number.

It is an amenable number.

653812 is a deficient number, since it is larger than the sum of its proper divisors (499088).

653812 is a wasteful number, since it uses less digits than its factorization.

653812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1250 (or 1248 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 653812 is about 808.5864208605. The cubic root of 653812 is about 86.7929192126.

The spelling of 653812 in words is "six hundred fifty-three thousand, eight hundred twelve".