42807530 has 16 divisors (see below), whose sum is σ = 81586440. Its totient is φ = 16115712.

The previous prime is 42807503. The next prime is 42807539. The reversal of 42807530 is 3570824.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 30283009 + 12524521 = 5503^2 + 3539^2 .

It is a super-3 number, since 3×42807530³ (a number of 24 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42807493 and 42807502.

It is not an unprimeable number, because it can be changed into a prime (42807539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125735 + ... + 126074.

Almost surely, 2^42807530 is an apocalyptic number.

42807530 is a deficient number, since it is larger than the sum of its proper divisors (38778910).

42807530 is a wasteful number, since it uses less digits than its factorization.

42807530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251833.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 42807530 is about 6542.7463652506. The cubic root of 42807530 is about 349.8163117762.

The spelling of 42807530 in words is "forty-two million, eight hundred seven thousand, five hundred thirty".