71995393 has 4 divisors (see below), whose sum is σ = 72804420. Its totient is φ = 71186368.

The previous prime is 71995387. The next prime is 71995397. The reversal of 71995393 is 39359917.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39359917 = 1061 ⋅37097.

It can be written as a sum of positive squares in 2 ways, for example, as 10419984 + 61575409 = 3228^2 + 7847^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71995393 is a prime.

It is a super-2 number, since 2×71995393² = 10366673226448898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71995397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 404380 + ... + 404557.

It is an arithmetic number, because the mean of its divisors is an integer number (18201105).

Almost surely, 2^71995393 is an apocalyptic number.

It is an amenable number.

71995393 is a deficient number, since it is larger than the sum of its proper divisors (809027).

71995393 is an equidigital number, since it uses as much as digits as its factorization.

71995393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809026.

The product of its digits is 229635, while the sum is 46.

The square root of 71995393 is about 8485.0098998174. The cubic root of 71995393 is about 416.0078913228.

The spelling of 71995393 in words is "seventy-one million, nine hundred ninety-five thousand, three hundred ninety-three".