653423 has 4 divisors (see below), whose sum is σ = 662448. Its totient is φ = 644400.

The previous prime is 653363. The next prime is 653431. The reversal of 653423 is 324356.

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

It is a cyclic number.

It is not a de Polignac number, because 653423 - 2¹⁶ = 587887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (653473) by changing a digit.

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, 4403 + ... + 4548.

It is an arithmetic number, because the mean of its divisors is an integer number (165612).

2⁶⁵³⁴²³ is an apocalyptic number.

653423 is a deficient number, since it is larger than the sum of its proper divisors (9025).

653423 is an equidigital number, since it uses as much as digits as its factorization.

653423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9024.

The product of its digits is 2160, while the sum is 23.

The square root of 653423 is about 808.3458418276. The cubic root of 653423 is about 86.7757026714.

Adding to 653423 its reverse (324356), we get a palindrome (977779).

The spelling of 653423 in words is "six hundred fifty-three thousand, four hundred twenty-three".