71939443 has 2 divisors, whose sum is σ = 71939444. Its totient is φ = 71939442.

The previous prime is 71939431. The next prime is 71939471. The reversal of 71939443 is 34493917.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71939443 - 2⁹ = 71938931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71939396 and 71939405.

It is not a weakly prime, because it can be changed into another prime (71939143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35969721 + 35969722.

It is an arithmetic number, because the mean of its divisors is an integer number (35969722).

Almost surely, 2^71939443 is an apocalyptic number.

71939443 is a deficient number, since it is larger than the sum of its proper divisors (1).

71939443 is an equidigital number, since it uses as much as digits as its factorization.

71939443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 40.

The square root of 71939443 is about 8481.7122681685. The cubic root of 71939443 is about 415.9000988999.

The spelling of 71939443 in words is "seventy-one million, nine hundred thirty-nine thousand, four hundred forty-three".