8405249243 has 4 divisors (see below), whose sum is σ = 8407007688. Its totient is φ = 8403490800.

The previous prime is 8405249233. The next prime is 8405249261. The reversal of 8405249243 is 3429425048.

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

It is a cyclic number.

It is not a de Polignac number, because 8405249243 - 2¹⁰ = 8405248219 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8405249243.

It is not an unprimeable number, because it can be changed into a prime (8405249233) 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, 872033 + ... + 881618.

It is an arithmetic number, because the mean of its divisors is an integer number (2101751922).

Almost surely, 2^8405249243 is an apocalyptic number.

8405249243 is a deficient number, since it is larger than the sum of its proper divisors (1758445).

8405249243 is a wasteful number, since it uses less digits than its factorization.

8405249243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1758444.

The product of its (nonzero) digits is 276480, while the sum is 41.

The square root of 8405249243 is about 91680.1463949529. The cubic root of 8405249243 is about 2033.2160628745.

The spelling of 8405249243 in words is "eight billion, four hundred five million, two hundred forty-nine thousand, two hundred forty-three".