42040420 has 12 divisors (see below), whose sum is σ = 88284924. Its totient is φ = 16816160.

The previous prime is 42040417. The next prime is 42040421. The reversal of 42040420 is 2404024.

It can be written as a sum of positive squares in 2 ways, for example, as 27478564 + 14561856 = 5242^2 + 3816^2 .

It is a junction number, because it is equal to n+sod(n) for n = 42040394 and 42040403.

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 in 3 ways as a sum of consecutive naturals, for example, 1050991 + ... + 1051030.

It is an arithmetic number, because the mean of its divisors is an integer number (7357077).

Almost surely, 2^42040420 is an apocalyptic number.

It is an amenable number.

42040420 is an abundant number, since it is smaller than the sum of its proper divisors (46244504).

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

42040420 is a wasteful number, since it uses less digits than its factorization.

42040420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2102030 (or 2102028 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 42040420 is about 6483.8584191822. The cubic root of 42040420 is about 347.7141374642.

Adding to 42040420 its reverse (2404024), we get a palindrome (44444444).

The spelling of 42040420 in words is "forty-two million, forty thousand, four hundred twenty".