71939387 has 8 divisors (see below), whose sum is σ = 79275504. Its totient is φ = 64860768.

The previous prime is 71939381. The next prime is 71939407. The reversal of 71939387 is 78393917.

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 71939387 - 2¹² = 71935291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71939381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63788 + ... + 64905.

It is an arithmetic number, because the mean of its divisors is an integer number (9909438).

Almost surely, 2^71939387 is an apocalyptic number.

71939387 is a deficient number, since it is larger than the sum of its proper divisors (7336117).

71939387 is a wasteful number, since it uses less digits than its factorization.

71939387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128749.

The product of its digits is 285768, while the sum is 47.

The square root of 71939387 is about 8481.7089669476. The cubic root of 71939387 is about 415.8999909832.

The spelling of 71939387 in words is "seventy-one million, nine hundred thirty-nine thousand, three hundred eighty-seven".