71906 has 8 divisors (see below), whose sum is σ = 109020. Its totient is φ = 35568.

The previous prime is 71899. The next prime is 71909. The reversal of 71906 is 60917.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 70225 + 1681 = 265^2 + 41^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200 + ... + 428.

2⁷¹⁹⁰⁶ is an apocalyptic number.

71906 is a deficient number, since it is larger than the sum of its proper divisors (37114).

71906 is a wasteful number, since it uses less digits than its factorization.

71906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 71906 is about 268.1529414345. The cubic root of 71906 is about 41.5835641433.

The spelling of 71906 in words is "seventy-one thousand, nine hundred six".