642315 has 8 divisors (see below), whose sum is σ = 1027728. Its totient is φ = 342560.

The previous prime is 642281. The next prime is 642359. The reversal of 642315 is 513246.

It is a happy number.

642315 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 642315 - 2⁹ = 641803 is a prime.

642315 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 642291 and 642300.

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, 21396 + ... + 21425.

It is an arithmetic number, because the mean of its divisors is an integer number (128466).

2⁶⁴²³¹⁵ is an apocalyptic number.

642315 is a deficient number, since it is larger than the sum of its proper divisors (385413).

642315 is a wasteful number, since it uses less digits than its factorization.

642315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42829.

The product of its digits is 720, while the sum is 21.

The square root of 642315 is about 801.4455689565. The cubic root of 642315 is about 86.2811691590.

The spelling of 642315 in words is "six hundred forty-two thousand, three hundred fifteen".