42040424 has 8 divisors (see below), whose sum is σ = 78825810. Its totient is φ = 21020208.

The previous prime is 42040421. The next prime is 42040447. The reversal of 42040424 is 42404024.

It can be written as a sum of positive squares in only one way, i.e., 35880100 + 6160324 = 5990^2 + 2482^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 42040396 and 42040405.

It is not an unprimeable number, because it can be changed into a prime (42040421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2627519 + ... + 2627534.

Almost surely, 2^42040424 is an apocalyptic number.

It is an amenable number.

42040424 is a deficient number, since it is larger than the sum of its proper divisors (36785386).

42040424 is a wasteful number, since it uses less digits than its factorization.

42040424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5255059 (or 5255055 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 20.

The square root of 42040424 is about 6483.8587276405. The cubic root of 42040424 is about 347.7141484922.

Adding to 42040424 its reverse (42404024), we get a palindrome (84444448).

The spelling of 42040424 in words is "forty-two million, forty thousand, four hundred twenty-four".