71290393 has 4 divisors (see below), whose sum is σ = 71315748. Its totient is φ = 71265040.

The previous prime is 71290369. The next prime is 71290397. The reversal of 71290393 is 39309217.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 45198729 + 26091664 = 6723^2 + 5108^2 .

It is a cyclic number.

It is not a de Polignac number, because 71290393 - 2⁵ = 71290361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71290397) 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, 7846 + ... + 14287.

It is an arithmetic number, because the mean of its divisors is an integer number (17828937).

Almost surely, 2^71290393 is an apocalyptic number.

It is an amenable number.

71290393 is a deficient number, since it is larger than the sum of its proper divisors (25355).

71290393 is a wasteful number, since it uses less digits than its factorization.

71290393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25354.

The product of its (nonzero) digits is 10206, while the sum is 34.

The square root of 71290393 is about 8443.3638438717. The cubic root of 71290393 is about 414.6455443445.

The spelling of 71290393 in words is "seventy-one million, two hundred ninety thousand, three hundred ninety-three".