642145 has 12 divisors (see below), whose sum is σ = 896724. Its totient is φ = 440160.

The previous prime is 642133. The next prime is 642149. The reversal of 642145 is 541246.

It can be written as a sum of positive squares in 2 ways, for example, as 388129 + 254016 = 623^2 + 504^2 .

It is not a de Polignac number, because 642145 - 2⁵ = 642113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642149) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1066 + ... + 1555.

It is an arithmetic number, because the mean of its divisors is an integer number (74727).

2⁶⁴²¹⁴⁵ is an apocalyptic number.

It is an amenable number.

642145 is a deficient number, since it is larger than the sum of its proper divisors (254579).

642145 is a wasteful number, since it uses less digits than its factorization.

642145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2640 (or 2633 counting only the distinct ones).

The product of its digits is 960, while the sum is 22.

The square root of 642145 is about 801.3395035813. The cubic root of 642145 is about 86.2735565426.

It can be divided in two parts, 642 and 145, that added together give a palindrome (787).

The spelling of 642145 in words is "six hundred forty-two thousand, one hundred forty-five".