42402 has 16 divisors (see below), whose sum is σ = 87552.
Its totient is φ = 13680.
The previous prime is 42397. The next prime is 42403. The reversal of 42402 is 20424.
Adding to 42402 its reverse (20424), we get a palindrome (62826).
It can be divided in two parts, 42 and 402, that added together give a palindrome (444).
It is an Ulam number.
It is not an unprimeable number, because it can be changed into a prime (42403) by changing a digit.
42402 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127 + ... + 317.
It is an arithmetic number, because the mean of its divisors is an integer number (5472).
242402 is an apocalyptic number.
42402 is an abundant number, since it is smaller than the sum of its proper divisors (45150).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43776).
42402 is a wasteful number, since it uses less digits than its factorization.
42402 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 233.
The product of its (nonzero) digits is 64, while the sum is 12.
The square root of 42402 is about 205.9174591918.
The cubic root of 42402 is about 34.8708162913.
The spelling of 42402 in words is "forty-two thousand, four hundred two", and thus it is an iban number.