72430909 has 2 divisors, whose sum is σ = 72430910. Its totient is φ = 72430908.

The previous prime is 72430889. The next prime is 72430921. The reversal of 72430909 is 90903427.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71825625 + 605284 = 8475^2 + 778^2 .

It is a cyclic number.

It is not a de Polignac number, because 72430909 - 2¹¹ = 72428861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72430409) 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, 36215454 + 36215455.

It is an arithmetic number, because the mean of its divisors is an integer number (36215455).

Almost surely, 2^72430909 is an apocalyptic number.

It is an amenable number.

72430909 is a deficient number, since it is larger than the sum of its proper divisors (1).

72430909 is an equidigital number, since it uses as much as digits as its factorization.

72430909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 72430909 is about 8510.6350526856. The cubic root of 72430909 is about 416.8450466802.

The spelling of 72430909 in words is "seventy-two million, four hundred thirty thousand, nine hundred nine".