72229397 has 2 divisors, whose sum is σ = 72229398. Its totient is φ = 72229396.

The previous prime is 72229369. The next prime is 72229427. The reversal of 72229397 is 79392227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54848836 + 17380561 = 7406^2 + 4169^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72229397 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72229327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36114698 + 36114699.

It is an arithmetic number, because the mean of its divisors is an integer number (36114699).

Almost surely, 2^72229397 is an apocalyptic number.

It is an amenable number.

72229397 is a deficient number, since it is larger than the sum of its proper divisors (1).

72229397 is an equidigital number, since it uses as much as digits as its factorization.

72229397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 95256, while the sum is 41.

The square root of 72229397 is about 8498.7879724111. The cubic root of 72229397 is about 416.4581156507.

The spelling of 72229397 in words is "seventy-two million, two hundred twenty-nine thousand, three hundred ninety-seven".