71293939 has 8 divisors (see below), whose sum is σ = 72000000. Its totient is φ = 70591752.

The previous prime is 71293913. The next prime is 71293969. The reversal of 71293939 is 93939217.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71293939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71293895 and 71293904.

It is not an unprimeable number, because it can be changed into a prime (71293969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46812 + ... + 48310.

It is an arithmetic number, because the mean of its divisors is an integer number (9000000).

Almost surely, 2^71293939 is an apocalyptic number.

71293939 is a deficient number, since it is larger than the sum of its proper divisors (706061).

71293939 is a wasteful number, since it uses less digits than its factorization.

71293939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1937.

The product of its digits is 91854, while the sum is 43.

The square root of 71293939 is about 8443.5738286581. The cubic root of 71293939 is about 414.6524190844.

The spelling of 71293939 in words is "seventy-one million, two hundred ninety-three thousand, nine hundred thirty-nine".