72518389 has 2 divisors, whose sum is σ = 72518390. Its totient is φ = 72518388.

The previous prime is 72518387. The next prime is 72518401. The reversal of 72518389 is 98381527.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70140625 + 2377764 = 8375^2 + 1542^2 .

It is a cyclic number.

It is not a de Polignac number, because 72518389 - 2¹ = 72518387 is a prime.

Together with 72518387, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72518387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36259194 + 36259195.

It is an arithmetic number, because the mean of its divisors is an integer number (36259195).

Almost surely, 2^72518389 is an apocalyptic number.

It is an amenable number.

72518389 is a deficient number, since it is larger than the sum of its proper divisors (1).

72518389 is an equidigital number, since it uses as much as digits as its factorization.

72518389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 43.

The square root of 72518389 is about 8515.7729537606. The cubic root of 72518389 is about 417.0127970432.

The spelling of 72518389 in words is "seventy-two million, five hundred eighteen thousand, three hundred eighty-nine".