72242939 has 2 divisors, whose sum is σ = 72242940. Its totient is φ = 72242938.

The previous prime is 72242903. The next prime is 72242941. The reversal of 72242939 is 93924227.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72242939 is a prime.

It is a Sophie Germain prime.

Together with 72242941, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72242539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36121469 + 36121470.

It is an arithmetic number, because the mean of its divisors is an integer number (36121470).

Almost surely, 2^72242939 is an apocalyptic number.

72242939 is a deficient number, since it is larger than the sum of its proper divisors (1).

72242939 is an equidigital number, since it uses as much as digits as its factorization.

72242939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 38.

The square root of 72242939 is about 8499.5846369102. The cubic root of 72242939 is about 416.4841407117.

The spelling of 72242939 in words is "seventy-two million, two hundred forty-two thousand, nine hundred thirty-nine".