71939445 has 8 divisors (see below), whose sum is σ = 115103136. Its totient is φ = 38367696.

The previous prime is 71939443. The next prime is 71939471. The reversal of 71939445 is 54493917.

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

It is not a de Polignac number, because 71939445 - 2¹ = 71939443 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71939397 and 71939406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71939443) 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, 2397967 + ... + 2397996.

It is an arithmetic number, because the mean of its divisors is an integer number (14387892).

Almost surely, 2^71939445 is an apocalyptic number.

It is an amenable number.

71939445 is a deficient number, since it is larger than the sum of its proper divisors (43163691).

71939445 is a wasteful number, since it uses less digits than its factorization.

71939445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4795971.

The product of its digits is 136080, while the sum is 42.

The square root of 71939445 is about 8481.7123860692. The cubic root of 71939445 is about 415.9001027541.

The spelling of 71939445 in words is "seventy-one million, nine hundred thirty-nine thousand, four hundred forty-five".