642045 has 16 divisors (see below), whose sum is σ = 1072512. Its totient is φ = 327360.

The previous prime is 642013. The next prime is 642049. The reversal of 642045 is 540246.

It is a happy number.

It is not a de Polignac number, because 642045 - 2⁵ = 642013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 586 + ... + 1275.

It is an arithmetic number, because the mean of its divisors is an integer number (67032).

2⁶⁴²⁰⁴⁵ is an apocalyptic number.

It is an amenable number.

642045 is a deficient number, since it is larger than the sum of its proper divisors (430467).

642045 is a wasteful number, since it uses less digits than its factorization.

642045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1892.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 642045 is about 801.2771056258. The cubic root of 642045 is about 86.2690779054.

The spelling of 642045 in words is "six hundred forty-two thousand, forty-five".