42009530 has 8 divisors (see below), whose sum is σ = 75617172. Its totient is φ = 16803808.

The previous prime is 42009509. The next prime is 42009571. The reversal of 42009530 is 3590024.

It can be written as a sum of positive squares in 2 ways, for example, as 39150049 + 2859481 = 6257^2 + 1691^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×42009530² = 3529601221641800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42009496 and 42009505.

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, 2100467 + ... + 2100486.

Almost surely, 2^42009530 is an apocalyptic number.

42009530 is a deficient number, since it is larger than the sum of its proper divisors (33607642).

42009530 is a wasteful number, since it uses less digits than its factorization.

42009530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4200960.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 42009530 is about 6481.4759121669. The cubic root of 42009530 is about 347.6289534003.

Adding to 42009530 its reverse (3590024), we get a palindrome (45599554).

The spelling of 42009530 in words is "forty-two million, nine thousand, five hundred thirty".