71905939 has 8 divisors (see below), whose sum is σ = 82241888. Its totient is φ = 61585920.

The previous prime is 71905931. The next prime is 71905963. The reversal of 71905939 is 93950917.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71905939 - 2³ = 71905931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71905895 and 71905904.

It is not an unprimeable number, because it can be changed into a prime (71905931) 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 7 ways as a sum of consecutive naturals, for example, 8179 + ... + 14515.

It is an arithmetic number, because the mean of its divisors is an integer number (10280236).

Almost surely, 2^71905939 is an apocalyptic number.

71905939 is a deficient number, since it is larger than the sum of its proper divisors (10335949).

71905939 is a wasteful number, since it uses less digits than its factorization.

71905939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7965.

The product of its (nonzero) digits is 76545, while the sum is 43.

The square root of 71905939 is about 8479.7369652602. The cubic root of 71905939 is about 415.8355238440.

The spelling of 71905939 in words is "seventy-one million, nine hundred five thousand, nine hundred thirty-nine".