642385 has 4 divisors (see below), whose sum is σ = 770868. Its totient is φ = 513904.

The previous prime is 642373. The next prime is 642403. The reversal of 642385 is 583246.

642385 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.

It can be written as a sum of positive squares in 2 ways, for example, as 253009 + 389376 = 503^2 + 624^2 .

It is a cyclic number.

It is not a de Polignac number, because 642385 - 2⁹ = 641873 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64234 + ... + 64243.

It is an arithmetic number, because the mean of its divisors is an integer number (192717).

2⁶⁴²³⁸⁵ is an apocalyptic number.

It is an amenable number.

642385 is a deficient number, since it is larger than the sum of its proper divisors (128483).

642385 is a wasteful number, since it uses less digits than its factorization.

642385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128482.

The product of its digits is 5760, while the sum is 28.

The square root of 642385 is about 801.4892388548. The cubic root of 642385 is about 86.2843033753.

The spelling of 642385 in words is "six hundred forty-two thousand, three hundred eighty-five".