71749393 has 4 divisors (see below), whose sum is σ = 74223540. Its totient is φ = 69275248.

The previous prime is 71749387. The next prime is 71749409. The reversal of 71749393 is 39394717.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39394717 = 2503 ⋅15739.

It can be written as a sum of positive squares in 2 ways, for example, as 32398864 + 39350529 = 5692^2 + 6273^2 .

It is a cyclic number.

It is not a de Polignac number, because 71749393 - 2⁵ = 71749361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71749313) 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, 1237030 + ... + 1237087.

It is an arithmetic number, because the mean of its divisors is an integer number (18555885).

Almost surely, 2^71749393 is an apocalyptic number.

It is an amenable number.

71749393 is a deficient number, since it is larger than the sum of its proper divisors (2474147).

71749393 is a wasteful number, since it uses less digits than its factorization.

71749393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2474146.

The product of its digits is 142884, while the sum is 43.

The square root of 71749393 is about 8470.5013428958. The cubic root of 71749393 is about 415.5335335537.

The spelling of 71749393 in words is "seventy-one million, seven hundred forty-nine thousand, three hundred ninety-three".