42015520 has 24 divisors (see below), whose sum is σ = 99262044. Its totient is φ = 16806144.

The previous prime is 42015487. The next prime is 42015527. The reversal of 42015520 is 2551024.

It can be written as a sum of positive squares in 2 ways, for example, as 40908816 + 1106704 = 6396^2 + 1052^2 .

It is not an unprimeable number, because it can be changed into a prime (42015527) 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, 131139 + ... + 131458.

Almost surely, 2^42015520 is an apocalyptic number.

42015520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42015520 is an abundant number, since it is smaller than the sum of its proper divisors (57246524).

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

42015520 is a wasteful number, since it uses less digits than its factorization.

42015520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262612 (or 262604 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 42015520 is about 6481.9379818076. The cubic root of 42015520 is about 347.6454750362.

Adding to 42015520 its reverse (2551024), we get a palindrome (44566544).

The spelling of 42015520 in words is "forty-two million, fifteen thousand, five hundred twenty".