71397743 has 4 divisors (see below), whose sum is σ = 73700928. Its totient is φ = 69094560.

The previous prime is 71397737. The next prime is 71397757. The reversal of 71397743 is 34779317.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34779317 = 73 ⋅476429.

It is a cyclic number.

It is not a de Polignac number, because 71397743 - 2²² = 67203439 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71397743.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71397713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1151546 + ... + 1151607.

It is an arithmetic number, because the mean of its divisors is an integer number (18425232).

Almost surely, 2^71397743 is an apocalyptic number.

71397743 is a deficient number, since it is larger than the sum of its proper divisors (2303185).

71397743 is a wasteful number, since it uses less digits than its factorization.

71397743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2303184.

The product of its digits is 111132, while the sum is 41.

The square root of 71397743 is about 8449.7185160217. The cubic root of 71397743 is about 414.8535661814.

The spelling of 71397743 in words is "seventy-one million, three hundred ninety-seven thousand, seven hundred forty-three".