42435220 has 12 divisors (see below), whose sum is σ = 89114004. Its totient is φ = 16974080.

The previous prime is 42435203. The next prime is 42435221. The reversal of 42435220 is 2253424.

It can be written as a sum of positive squares in 2 ways, for example, as 8282884 + 34152336 = 2878^2 + 5844^2 .

It is a junction number, because it is equal to n+sod(n) for n = 42435191 and 42435200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42435221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1060861 + ... + 1060900.

It is an arithmetic number, because the mean of its divisors is an integer number (7426167).

Almost surely, 2^42435220 is an apocalyptic number.

It is an amenable number.

42435220 is an abundant number, since it is smaller than the sum of its proper divisors (46678784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42435220 is a wasteful number, since it uses less digits than its factorization.

42435220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2121770 (or 2121768 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 42435220 is about 6514.2321113083. The cubic root of 42435220 is about 348.7992046983.

Adding to 42435220 its reverse (2253424), we get a palindrome (44688644).

The spelling of 42435220 in words is "forty-two million, four hundred thirty-five thousand, two hundred twenty".