72439841 has 2 divisors, whose sum is σ = 72439842. Its totient is φ = 72439840.

The previous prime is 72439823. The next prime is 72439847. The reversal of 72439841 is 14893427.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60777616 + 11662225 = 7796^2 + 3415^2 .

It is a cyclic number.

It is not a de Polignac number, because 72439841 - 2¹⁴ = 72423457 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72439795 and 72439804.

It is not a weakly prime, because it can be changed into another prime (72439847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36219920 + 36219921.

It is an arithmetic number, because the mean of its divisors is an integer number (36219921).

Almost surely, 2^72439841 is an apocalyptic number.

It is an amenable number.

72439841 is a deficient number, since it is larger than the sum of its proper divisors (1).

72439841 is an equidigital number, since it uses as much as digits as its factorization.

72439841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 38.

The square root of 72439841 is about 8511.1597917088. The cubic root of 72439841 is about 416.8621807416.

The spelling of 72439841 in words is "seventy-two million, four hundred thirty-nine thousand, eight hundred forty-one".