642395 has 8 divisors (see below), whose sum is σ = 830256. Its totient is φ = 474336.

The previous prime is 642373. The next prime is 642403. The reversal of 642395 is 593246.

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 642395 - 2¹⁰ = 641371 is a prime.

It is a d-powerful number, because it can be written as 6² + 4² + 3¹² + 2¹⁵ + 9 + 5⁷ .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4877 + ... + 5006.

It is an arithmetic number, because the mean of its divisors is an integer number (103782).

2⁶⁴²³⁹⁵ is an apocalyptic number.

642395 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

642395 is a deficient number, since it is larger than the sum of its proper divisors (187861).

642395 is a wasteful number, since it uses less digits than its factorization.

642395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9901.

The product of its digits is 6480, while the sum is 29.

The square root of 642395 is about 801.4954772174. The cubic root of 642395 is about 86.2847511019.

The spelling of 642395 in words is "six hundred forty-two thousand, three hundred ninety-five".