71223979 has 4 divisors (see below), whose sum is σ = 71877520. Its totient is φ = 70570440.

The previous prime is 71223967. The next prime is 71224009. The reversal of 71223979 is 97932217.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 71223979 - 2¹⁷ = 71092907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71226979) 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, 326607 + ... + 326824.

It is an arithmetic number, because the mean of its divisors is an integer number (17969380).

Almost surely, 2^71223979 is an apocalyptic number.

71223979 is a deficient number, since it is larger than the sum of its proper divisors (653541).

71223979 is a wasteful number, since it uses less digits than its factorization.

71223979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653540.

The product of its digits is 47628, while the sum is 40.

The square root of 71223979 is about 8439.4300162985. The cubic root of 71223979 is about 414.5167433286.

The spelling of 71223979 in words is "seventy-one million, two hundred twenty-three thousand, nine hundred seventy-nine".