71939857 has 8 divisors (see below), whose sum is σ = 79362720. Its totient is φ = 64664160.

The previous prime is 71939839. The next prime is 71939897. The reversal of 71939857 is 75893917.

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

It is not a de Polignac number, because 71939857 - 2¹⁵ = 71907089 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71939857.

It is not an unprimeable number, because it can be changed into a prime (71939897) 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, 35763 + ... + 37720.

It is an arithmetic number, because the mean of its divisors is an integer number (9920340).

Almost surely, 2^71939857 is an apocalyptic number.

It is an amenable number.

71939857 is a deficient number, since it is larger than the sum of its proper divisors (7422863).

71939857 is a wasteful number, since it uses less digits than its factorization.

71939857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73583.

The product of its digits is 476280, while the sum is 49.

The square root of 71939857 is about 8481.7366735828. The cubic root of 71939857 is about 415.9008967113.

The spelling of 71939857 in words is "seventy-one million, nine hundred thirty-nine thousand, eight hundred fifty-seven".