71939861 has 8 divisors (see below), whose sum is σ = 82278144. Its totient is φ = 61616880.

The previous prime is 71939839. The next prime is 71939897. The reversal of 71939861 is 16893917.

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 71939861 - 2⁶ = 71939797 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 (71939831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9236 + ... + 15138.

It is an arithmetic number, because the mean of its divisors is an integer number (10284768).

Almost surely, 2^71939861 is an apocalyptic number.

It is an amenable number.

71939861 is a deficient number, since it is larger than the sum of its proper divisors (10338283).

71939861 is a wasteful number, since it uses less digits than its factorization.

71939861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7651.

The product of its digits is 81648, while the sum is 44.

The square root of 71939861 is about 8481.7369093836. The cubic root of 71939861 is about 415.9009044196.

The spelling of 71939861 in words is "seventy-one million, nine hundred thirty-nine thousand, eight hundred sixty-one".