42009529 has 4 divisors (see below), whose sum is σ = 42585076. Its totient is φ = 41433984.

The previous prime is 42009509. The next prime is 42009571. The reversal of 42009529 is 92590024.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33039504 + 8970025 = 5748^2 + 2995^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42009529 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42009529.

It is not an unprimeable number, because it can be changed into a prime (42009509) 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, 287664 + ... + 287809.

It is an arithmetic number, because the mean of its divisors is an integer number (10646269).

Almost surely, 2^42009529 is an apocalyptic number.

It is an amenable number.

42009529 is a deficient number, since it is larger than the sum of its proper divisors (575547).

42009529 is an equidigital number, since it uses as much as digits as its factorization.

42009529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575546.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 42009529 is about 6481.4758350240. The cubic root of 42009529 is about 347.6289506420.

The spelling of 42009529 in words is "forty-two million, nine thousand, five hundred twenty-nine".