71391438 has 24 divisors (see below), whose sum is σ = 158280408. Its totient is φ = 23243472.

The previous prime is 71391401. The next prime is 71391457. The reversal of 71391438 is 83419317.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 45345 + ... + 46892.

It is an arithmetic number, because the mean of its divisors is an integer number (6595017).

Almost surely, 2^71391438 is an apocalyptic number.

71391438 is an abundant number, since it is smaller than the sum of its proper divisors (86888970).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71391438 is a wasteful number, since it uses less digits than its factorization.

71391438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92288 (or 92285 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 71391438 is about 8449.3454184333. The cubic root of 71391438 is about 414.8413541766.

The spelling of 71391438 in words is "seventy-one million, three hundred ninety-one thousand, four hundred thirty-eight".