71861443 has 4 divisors (see below), whose sum is σ = 72873648. Its totient is φ = 70849240.

The previous prime is 71861423. The next prime is 71861459. The reversal of 71861443 is 34416817.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34416817 = 139 ⋅247603.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71861443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71861399 and 71861408.

It is not an unprimeable number, because it can be changed into a prime (71861423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 505996 + ... + 506137.

It is an arithmetic number, because the mean of its divisors is an integer number (18218412).

Almost surely, 2^71861443 is an apocalyptic number.

71861443 is a deficient number, since it is larger than the sum of its proper divisors (1012205).

71861443 is a wasteful number, since it uses less digits than its factorization.

71861443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1012204.

The product of its digits is 16128, while the sum is 34.

The square root of 71861443 is about 8477.1128929607. The cubic root of 71861443 is about 415.7497319718.

The spelling of 71861443 in words is "seventy-one million, eight hundred sixty-one thousand, four hundred forty-three".