40289539 has 4 divisors (see below), whose sum is σ = 40327560. Its totient is φ = 40251520.

The previous prime is 40289527. The next prime is 40289563. The reversal of 40289539 is 93598204.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 40289539 - 2⁹ = 40289027 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40289569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17374 + ... + 19555.

It is an arithmetic number, because the mean of its divisors is an integer number (10081890).

Almost surely, 2^40289539 is an apocalyptic number.

40289539 is a deficient number, since it is larger than the sum of its proper divisors (38021).

40289539 is a wasteful number, since it uses less digits than its factorization.

40289539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38020.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 40289539 is about 6347.4041150694. The cubic root of 40289539 is about 342.8183808444.

The spelling of 40289539 in words is "forty million, two hundred eighty-nine thousand, five hundred thirty-nine".