71940193 has 4 divisors (see below), whose sum is σ = 77474068. Its totient is φ = 66406320.

The previous prime is 71940191. The next prime is 71940203. The reversal of 71940193 is 39104917.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39104917 = 2029 ⋅19273.

It can be written as a sum of positive squares in 2 ways, for example, as 35856144 + 36084049 = 5988^2 + 6007^2 .

It is a cyclic number.

It is not a de Polignac number, because 71940193 - 2¹ = 71940191 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71940191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2766918 + ... + 2766943.

It is an arithmetic number, because the mean of its divisors is an integer number (19368517).

Almost surely, 2^71940193 is an apocalyptic number.

It is an amenable number.

71940193 is a deficient number, since it is larger than the sum of its proper divisors (5533875).

71940193 is a wasteful number, since it uses less digits than its factorization.

71940193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5533874.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 71940193 is about 8481.7564808240. The cubic root of 71940193 is about 415.9015442081.

The spelling of 71940193 in words is "seventy-one million, nine hundred forty thousand, one hundred ninety-three".