72909539 has 2 divisors, whose sum is σ = 72909540. Its totient is φ = 72909538.

The previous prime is 72909533. The next prime is 72909541. The reversal of 72909539 is 93590927.

It is a strong prime.

It is an emirp because it is prime and its reverse (93590927) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72909539 - 2⁴ = 72909523 is a prime.

Together with 72909541, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72909539.

It is not a weakly prime, because it can be changed into another prime (72909533) 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 as a sum of consecutive naturals, namely, 36454769 + 36454770.

It is an arithmetic number, because the mean of its divisors is an integer number (36454770).

Almost surely, 2^72909539 is an apocalyptic number.

72909539 is a deficient number, since it is larger than the sum of its proper divisors (1).

72909539 is an equidigital number, since it uses as much as digits as its factorization.

72909539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 153090, while the sum is 44.

The square root of 72909539 is about 8538.7082746748. The cubic root of 72909539 is about 417.7612148543.

The spelling of 72909539 in words is "seventy-two million, nine hundred nine thousand, five hundred thirty-nine".