72208397 has 2 divisors, whose sum is σ = 72208398. Its totient is φ = 72208396.

The previous prime is 72208391. The next prime is 72208427. The reversal of 72208397 is 79380227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44970436 + 27237961 = 6706^2 + 5219^2 .

It is a cyclic number.

It is not a de Polignac number, because 72208397 - 2⁸ = 72208141 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72208397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72208391) 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, 36104198 + 36104199.

It is an arithmetic number, because the mean of its divisors is an integer number (36104199).

Almost surely, 2^72208397 is an apocalyptic number.

It is an amenable number.

72208397 is a deficient number, since it is larger than the sum of its proper divisors (1).

72208397 is an equidigital number, since it uses as much as digits as its factorization.

72208397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 72208397 is about 8497.5524123126. The cubic root of 72208397 is about 416.4177513462.

The spelling of 72208397 in words is "seventy-two million, two hundred eight thousand, three hundred ninety-seven".