72409387 has 2 divisors, whose sum is σ = 72409388. Its totient is φ = 72409386.

The previous prime is 72409373. The next prime is 72409417. The reversal of 72409387 is 78390427.

It is a weak prime.

It is an emirp because it is prime and its reverse (78390427) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72409387 - 2¹¹ = 72407339 is a prime.

It is not a weakly prime, because it can be changed into another prime (72409367) 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, 36204693 + 36204694.

It is an arithmetic number, because the mean of its divisors is an integer number (36204694).

Almost surely, 2^72409387 is an apocalyptic number.

72409387 is a deficient number, since it is larger than the sum of its proper divisors (1).

72409387 is an equidigital number, since it uses as much as digits as its factorization.

72409387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 72409387 is about 8509.3705407627. The cubic root of 72409387 is about 416.8037557087.

The spelling of 72409387 in words is "seventy-two million, four hundred nine thousand, three hundred eighty-seven".