72239381 has 2 divisors, whose sum is σ = 72239382. Its totient is φ = 72239380.

The previous prime is 72239369. The next prime is 72239411. The reversal of 72239381 is 18393227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45292900 + 26946481 = 6730^2 + 5191^2 .

It is a cyclic number.

It is not a de Polignac number, because 72239381 - 2⁶ = 72239317 is a prime.

It is a super-2 number, since 2×72239381² = 10437056334526322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72238381) 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, 36119690 + 36119691.

It is an arithmetic number, because the mean of its divisors is an integer number (36119691).

Almost surely, 2^72239381 is an apocalyptic number.

It is an amenable number.

72239381 is a deficient number, since it is larger than the sum of its proper divisors (1).

72239381 is an equidigital number, since it uses as much as digits as its factorization.

72239381 is an odious number, because the sum of its binary digits is odd.

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

The square root of 72239381 is about 8499.3753299875. The cubic root of 72239381 is about 416.4773032504.

The spelling of 72239381 in words is "seventy-two million, two hundred thirty-nine thousand, three hundred eighty-one".