642415 has 4 divisors (see below), whose sum is σ = 770904. Its totient is φ = 513928.

The previous prime is 642407. The next prime is 642419. The reversal of 642415 is 514246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 514246 = 2 ⋅257123.

It is a cyclic number.

It is not a de Polignac number, because 642415 - 2³ = 642407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64237 + ... + 64246.

It is an arithmetic number, because the mean of its divisors is an integer number (192726).

2⁶⁴²⁴¹⁵ is an apocalyptic number.

642415 is a deficient number, since it is larger than the sum of its proper divisors (128489).

642415 is a wasteful number, since it uses less digits than its factorization.

642415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128488.

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

The square root of 642415 is about 801.5079537971. The cubic root of 642415 is about 86.2856465411.

It can be divided in two parts, 64241 and 5, that added together give a palindrome (64246).

The spelling of 642415 in words is "six hundred forty-two thousand, four hundred fifteen".