42040520 has 64 divisors (see below), whose sum is σ = 97511040. Its totient is φ = 16307200.

The previous prime is 42040469. The next prime is 42040601. The reversal of 42040520 is 2504024.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 320855 + ... + 320985.

It is an arithmetic number, because the mean of its divisors is an integer number (1523610).

Almost surely, 2^42040520 is an apocalyptic number.

42040520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42040520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48755520).

42040520 is an abundant number, since it is smaller than the sum of its proper divisors (55470520).

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

42040520 is a wasteful number, since it uses less digits than its factorization.

42040520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326 (or 322 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 17.

The square root of 42040520 is about 6483.8661306353. The cubic root of 42040520 is about 347.7144131623.

Adding to 42040520 its reverse (2504024), we get a palindrome (44544544).

The spelling of 42040520 in words is "forty-two million, forty thousand, five hundred twenty".