71443739 has 2 divisors, whose sum is σ = 71443740. Its totient is φ = 71443738.

The previous prime is 71443717. The next prime is 71443751. The reversal of 71443739 is 93734417.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71443739 - 2²⁰ = 70395163 is a prime.

It is not a weakly prime, because it can be changed into another prime (71443759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35721869 + 35721870.

It is an arithmetic number, because the mean of its divisors is an integer number (35721870).

Almost surely, 2^71443739 is an apocalyptic number.

71443739 is a deficient number, since it is larger than the sum of its proper divisors (1).

71443739 is an equidigital number, since it uses as much as digits as its factorization.

71443739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 38.

The square root of 71443739 is about 8452.4398252812. The cubic root of 71443739 is about 414.9426329955.

The spelling of 71443739 in words is "seventy-one million, four hundred forty-three thousand, seven hundred thirty-nine".