71671439 has 16 divisors (see below), whose sum is σ = 91296000. Its totient is φ = 54774144.

The previous prime is 71671429. The next prime is 71671451. The reversal of 71671439 is 93417617.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71671439 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 (71671409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13589 + ... + 18110.

It is an arithmetic number, because the mean of its divisors is an integer number (5706000).

Almost surely, 2^71671439 is an apocalyptic number.

71671439 is a deficient number, since it is larger than the sum of its proper divisors (19624561).

71671439 is a wasteful number, since it uses less digits than its factorization.

71671439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31742.

The product of its digits is 31752, while the sum is 38.

The square root of 71671439 is about 8465.8985937702. The cubic root of 71671439 is about 415.3829899368.

The spelling of 71671439 in words is "seventy-one million, six hundred seventy-one thousand, four hundred thirty-nine".