8213042393 has 4 divisors (see below), whose sum is σ = 8214367140. Its totient is φ = 8211717648.

The previous prime is 8213042389. The next prime is 8213042407. The reversal of 8213042393 is 3932403128.

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 2230483984 + 5982558409 = 47228^2 + 77347^2 .

It is a cyclic number.

It is not a de Polignac number, because 8213042393 - 2² = 8213042389 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8213042303) 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, 653030 + ... + 665487.

It is an arithmetic number, because the mean of its divisors is an integer number (2053591785).

Almost surely, 2^8213042393 is an apocalyptic number.

It is an amenable number.

8213042393 is a deficient number, since it is larger than the sum of its proper divisors (1324747).

8213042393 is a wasteful number, since it uses less digits than its factorization.

8213042393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1324746.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 8213042393 is about 90625.8373368213. The cubic root of 8213042393 is about 2017.5982297276.

The spelling of 8213042393 in words is "eight billion, two hundred thirteen million, forty-two thousand, three hundred ninety-three".