71844979 has 4 divisors (see below), whose sum is σ = 71872984. Its totient is φ = 71816976.

The previous prime is 71844973. The next prime is 71844989. The reversal of 71844979 is 97944817.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97944817 = 3613 ⋅27109.

It is a cyclic number.

It is not a de Polignac number, because 71844979 - 2⁹ = 71844467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71844973) 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, 9717 + ... + 15430.

It is an arithmetic number, because the mean of its divisors is an integer number (17968246).

Almost surely, 2^71844979 is an apocalyptic number.

71844979 is a deficient number, since it is larger than the sum of its proper divisors (28005).

71844979 is a wasteful number, since it uses less digits than its factorization.

71844979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28004.

The product of its digits is 508032, while the sum is 49.

The square root of 71844979 is about 8476.1417520001. The cubic root of 71844979 is about 415.7179790776.

The spelling of 71844979 in words is "seventy-one million, eight hundred forty-four thousand, nine hundred seventy-nine".