71942821 has 8 divisors (see below), whose sum is σ = 72619200. Its totient is φ = 71269632.

The previous prime is 71942807. The next prime is 71942831. The reversal of 71942821 is 12824917.

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 71942821 - 2⁵ = 71942789 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 (71942831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72696 + ... + 73678.

It is an arithmetic number, because the mean of its divisors is an integer number (9077400).

Almost surely, 2^71942821 is an apocalyptic number.

It is an amenable number.

71942821 is a deficient number, since it is larger than the sum of its proper divisors (676379).

71942821 is a wasteful number, since it uses less digits than its factorization.

71942821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1595.

The product of its digits is 8064, while the sum is 34.

The square root of 71942821 is about 8481.9114001503. The cubic root of 71942821 is about 415.9066084886.

The spelling of 71942821 in words is "seventy-one million, nine hundred forty-two thousand, eight hundred twenty-one".