72040539 has 4 divisors (see below), whose sum is σ = 96054056. Its totient is φ = 48027024.

The previous prime is 72040489. The next prime is 72040541. The reversal of 72040539 is 93504027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93504027 = 3 ⋅31168009.

It is not a de Polignac number, because 72040539 - 2⁷ = 72040411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72040139) 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, 12006754 + ... + 12006759.

It is an arithmetic number, because the mean of its divisors is an integer number (24013514).

Almost surely, 2^72040539 is an apocalyptic number.

72040539 is a deficient number, since it is larger than the sum of its proper divisors (24013517).

72040539 is a wasteful number, since it uses less digits than its factorization.

72040539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24013516.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 72040539 is about 8487.6698215706. The cubic root of 72040539 is about 416.0948282187.

The spelling of 72040539 in words is "seventy-two million, forty thousand, five hundred thirty-nine".