42520040 has 16 divisors (see below), whose sum is σ = 95670180. Its totient is φ = 17008000.

The previous prime is 42520039. The next prime is 42520057. The reversal of 42520040 is 4002524.

It can be written as a sum of positive squares in 2 ways, for example, as 42276004 + 244036 = 6502^2 + 494^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 531461 + ... + 531540.

Almost surely, 2^42520040 is an apocalyptic number.

42520040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42520040 is an abundant number, since it is smaller than the sum of its proper divisors (53150140).

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

42520040 is a wasteful number, since it uses less digits than its factorization.

42520040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063012 (or 1063008 counting only the distinct ones).

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

The square root of 42520040 is about 6520.7392218981. The cubic root of 42520040 is about 349.0314446371.

Adding to 42520040 its reverse (4002524), we get a palindrome (46522564).

The spelling of 42520040 in words is "forty-two million, five hundred twenty thousand, forty".