71967949 has 4 divisors (see below), whose sum is σ = 72135360. Its totient is φ = 71800540.

The previous prime is 71967913. The next prime is 71967971. The reversal of 71967949 is 94976917.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94976917 = 7 ⋅13568131.

It is a cyclic number.

It is not a de Polignac number, because 71967949 - 2²¹ = 69870797 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71967896 and 71967905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71967349) 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 3 ways as a sum of consecutive naturals, for example, 83059 + ... + 83920.

It is an arithmetic number, because the mean of its divisors is an integer number (18033840).

Almost surely, 2^71967949 is an apocalyptic number.

It is an amenable number.

71967949 is a deficient number, since it is larger than the sum of its proper divisors (167411).

71967949 is a wasteful number, since it uses less digits than its factorization.

71967949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167410.

The product of its digits is 857304, while the sum is 52.

The square root of 71967949 is about 8483.3925407233. The cubic root of 71967949 is about 415.9550251088.

The spelling of 71967949 in words is "seventy-one million, nine hundred sixty-seven thousand, nine hundred forty-nine".