642355 has 8 divisors (see below), whose sum is σ = 880992. Its totient is φ = 440448.

The previous prime is 642281. The next prime is 642359. The reversal of 642355 is 553246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 642355 - 2⁹ = 641843 is a prime.

642355 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (642359) 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 7 ways as a sum of consecutive naturals, for example, 9142 + ... + 9211.

It is an arithmetic number, because the mean of its divisors is an integer number (110124).

2⁶⁴²³⁵⁵ is an apocalyptic number.

642355 is a deficient number, since it is larger than the sum of its proper divisors (238637).

642355 is a wasteful number, since it uses less digits than its factorization.

642355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18365.

The product of its digits is 3600, while the sum is 25.

The square root of 642355 is about 801.4705234754. The cubic root of 642355 is about 86.2829601676.

The spelling of 642355 in words is "six hundred forty-two thousand, three hundred fifty-five".