72243239 has 2 divisors, whose sum is σ = 72243240. Its totient is φ = 72243238.

The previous prime is 72243233. The next prime is 72243257. The reversal of 72243239 is 93234227.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (93234227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72243239 - 2⁸ = 72242983 is a prime.

It is a super-2 number, since 2×72243239² = 10438171162422242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72243233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36121619 + 36121620.

It is an arithmetic number, because the mean of its divisors is an integer number (36121620).

Almost surely, 2^72243239 is an apocalyptic number.

72243239 is a deficient number, since it is larger than the sum of its proper divisors (1).

72243239 is an equidigital number, since it uses as much as digits as its factorization.

72243239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 32.

The square root of 72243239 is about 8499.6022848131. The cubic root of 72243239 is about 416.4847172159.

The spelling of 72243239 in words is "seventy-two million, two hundred forty-three thousand, two hundred thirty-nine".