71973543 has 4 divisors (see below), whose sum is σ = 95964728. Its totient is φ = 47982360.

The previous prime is 71973521. The next prime is 71973553. The reversal of 71973543 is 34537917.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 71973543 - 2⁶ = 71973479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71973553) 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, 11995588 + ... + 11995593.

It is an arithmetic number, because the mean of its divisors is an integer number (23991182).

Almost surely, 2^71973543 is an apocalyptic number.

71973543 is a deficient number, since it is larger than the sum of its proper divisors (23991185).

71973543 is a wasteful number, since it uses less digits than its factorization.

71973543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23991184.

The product of its digits is 79380, while the sum is 39.

The square root of 71973543 is about 8483.7222373201. The cubic root of 71973543 is about 415.9658020920.

The spelling of 71973543 in words is "seventy-one million, nine hundred seventy-three thousand, five hundred forty-three".