72240187 has 2 divisors, whose sum is σ = 72240188. Its totient is φ = 72240186.

The previous prime is 72240173. The next prime is 72240241. The reversal of 72240187 is 78104227.

It is a weak prime.

It is an emirp because it is prime and its reverse (78104227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72240187 - 2¹¹ = 72238139 is a prime.

It is not a weakly prime, because it can be changed into another prime (72240127) 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, 36120093 + 36120094.

It is an arithmetic number, because the mean of its divisors is an integer number (36120094).

Almost surely, 2^72240187 is an apocalyptic number.

72240187 is a deficient number, since it is larger than the sum of its proper divisors (1).

72240187 is an equidigital number, since it uses as much as digits as its factorization.

72240187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 72240187 is about 8499.4227451045. The cubic root of 72240187 is about 416.4788521722.

It can be divided in two parts, 72240 and 187, that added together give a palindrome (72427).

The spelling of 72240187 in words is "seventy-two million, two hundred forty thousand, one hundred eighty-seven".