653643 has 16 divisors (see below), whose sum is σ = 992640. Its totient is φ = 424872.

The previous prime is 653641. The next prime is 653647. The reversal of 653643 is 346356.

653643 is a `hidden beast` number, since 653 + 6 + 4 + 3 = 666.

It is not a de Polignac number, because 653643 - 2¹ = 653641 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 653643.

It is not an unprimeable number, because it can be changed into a prime (653641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 880 + ... + 1442.

It is an arithmetic number, because the mean of its divisors is an integer number (62040).

2⁶⁵³⁶⁴³ is an apocalyptic number.

653643 is a deficient number, since it is larger than the sum of its proper divisors (338997).

653643 is a wasteful number, since it uses less digits than its factorization.

653643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615 (or 609 counting only the distinct ones).

The product of its digits is 6480, while the sum is 27.

The square root of 653643 is about 808.4819107438. The cubic root of 653643 is about 86.7854403719.

Adding to 653643 its reverse (346356), we get a palindrome (999999).

It can be divided in two parts, 653 and 643, that added together give a 4-th power (1296 = 6⁴).

The spelling of 653643 in words is "six hundred fifty-three thousand, six hundred forty-three".