43242509 has 16 divisors (see below), whose sum is σ = 47692800. Its totient is φ = 39024384.

The previous prime is 43242497. The next prime is 43242517. The reversal of 43242509 is 90524234.

It is not a de Polignac number, because 43242509 - 2²⁴ = 26465293 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43242569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117644 + ... + 118010.

It is an arithmetic number, because the mean of its divisors is an integer number (2980800).

Almost surely, 2^43242509 is an apocalyptic number.

It is an amenable number.

43242509 is a deficient number, since it is larger than the sum of its proper divisors (4450291).

43242509 is a wasteful number, since it uses less digits than its factorization.

43242509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 43242509 is about 6575.9036641362. The cubic root of 43242509 is about 350.9971807362.

The spelling of 43242509 in words is "forty-three million, two hundred forty-two thousand, five hundred nine".