42724509 has 8 divisors (see below), whose sum is σ = 57470592. Its totient is φ = 28230720.

The previous prime is 42724481. The next prime is 42724531. The reversal of 42724509 is 90542724.

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

It is not a de Polignac number, because 42724509 - 2²¹ = 40627357 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 42724509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42724579) 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, 62677 + ... + 63354.

It is an arithmetic number, because the mean of its divisors is an integer number (7183824).

Almost surely, 2^42724509 is an apocalyptic number.

It is an amenable number.

42724509 is a deficient number, since it is larger than the sum of its proper divisors (14746083).

42724509 is a wasteful number, since it uses less digits than its factorization.

42724509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126147.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 42724509 is about 6536.3987791444. The cubic root of 42724509 is about 349.5900206304.

The spelling of 42724509 in words is "forty-two million, seven hundred twenty-four thousand, five hundred nine".