71439105 has 16 divisors (see below), whose sum is σ = 114713280. Its totient is φ = 37963968.

The previous prime is 71439103. The next prime is 71439161. The reversal of 71439105 is 50193417.

It is not a de Polignac number, because 71439105 - 2¹ = 71439103 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71439103) 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 15 ways as a sum of consecutive naturals, for example, 4170 + ... + 12659.

It is an arithmetic number, because the mean of its divisors is an integer number (7169580).

Almost surely, 2^71439105 is an apocalyptic number.

It is an amenable number.

71439105 is a deficient number, since it is larger than the sum of its proper divisors (43274175).

71439105 is a wasteful number, since it uses less digits than its factorization.

71439105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17120.

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 71439105 is about 8452.1656988017. The cubic root of 71439105 is about 414.9336614338.

The spelling of 71439105 in words is "seventy-one million, four hundred thirty-nine thousand, one hundred five".