642353 has 4 divisors (see below), whose sum is σ = 644160. Its totient is φ = 640548.

The previous prime is 642281. The next prime is 642359. The reversal of 642353 is 353246.

642353 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a cyclic number.

It is not a de Polignac number, because 642353 - 2¹⁴ = 625969 is a prime.

It is a d-powerful number, because it can be written as 6 + 4 + 3² + 2¹⁵ + 5⁷ + 3¹² .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173 + ... + 1146.

It is an arithmetic number, because the mean of its divisors is an integer number (161040).

2⁶⁴²³⁵³ is an apocalyptic number.

It is an amenable number.

642353 is a deficient number, since it is larger than the sum of its proper divisors (1807).

642353 is a wasteful number, since it uses less digits than its factorization.

642353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1806.

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

The square root of 642353 is about 801.4692757679. The cubic root of 642353 is about 86.2828706189.

Adding to 642353 its reverse (353246), we get a palindrome (995599).

The spelling of 642353 in words is "six hundred forty-two thousand, three hundred fifty-three".