72238139 has 2 divisors, whose sum is σ = 72238140. Its totient is φ = 72238138.

The previous prime is 72238121. The next prime is 72238141. The reversal of 72238139 is 93183227.

It is a strong prime.

It is an emirp because it is prime and its reverse (93183227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72238139 - 2¹⁶ = 72172603 is a prime.

Together with 72238141, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 72238099 and 72238108.

It is not a weakly prime, because it can be changed into another prime (72238109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36119069 + 36119070.

It is an arithmetic number, because the mean of its divisors is an integer number (36119070).

Almost surely, 2^72238139 is an apocalyptic number.

72238139 is a deficient number, since it is larger than the sum of its proper divisors (1).

72238139 is an equidigital number, since it uses as much as digits as its factorization.

72238139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 35.

The square root of 72238139 is about 8499.3022654804. The cubic root of 72238139 is about 416.4749164277.

The spelling of 72238139 in words is "seventy-two million, two hundred thirty-eight thousand, one hundred thirty-nine".