72247429 has 2 divisors, whose sum is σ = 72247430. Its totient is φ = 72247428.

The previous prime is 72247423. The next prime is 72247457. The reversal of 72247429 is 92474227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70812225 + 1435204 = 8415^2 + 1198^2 .

It is an emirp because it is prime and its reverse (92474227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72247429 - 2⁵ = 72247397 is a prime.

It is a super-2 number, since 2×72247429² = 10439381994220082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72247423) 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, 36123714 + 36123715.

It is an arithmetic number, because the mean of its divisors is an integer number (36123715).

Almost surely, 2^72247429 is an apocalyptic number.

It is an amenable number.

72247429 is a deficient number, since it is larger than the sum of its proper divisors (1).

72247429 is an equidigital number, since it uses as much as digits as its factorization.

72247429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 37.

The square root of 72247429 is about 8499.8487633604. The cubic root of 72247429 is about 416.4927688908.

The spelling of 72247429 in words is "seventy-two million, two hundred forty-seven thousand, four hundred twenty-nine".