8423997861 has 16 divisors (see below), whose sum is σ = 11604809216. Its totient is φ = 5432129136.

The previous prime is 8423997853. The next prime is 8423997899. The reversal of 8423997861 is 1687993248.

It is not a de Polignac number, because 8423997861 - 2³ = 8423997853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8423997061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 303715 + ... + 330288.

It is an arithmetic number, because the mean of its divisors is an integer number (725300576).

Almost surely, 2^8423997861 is an apocalyptic number.

It is an amenable number.

8423997861 is a deficient number, since it is larger than the sum of its proper divisors (3180811355).

8423997861 is a wasteful number, since it uses less digits than its factorization.

8423997861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634152.

The product of its digits is 5225472, while the sum is 57.

The square root of 8423997861 is about 91782.3395921024. The cubic root of 8423997861 is about 2034.7266935910.

The spelling of 8423997861 in words is "eight billion, four hundred twenty-three million, nine hundred ninety-seven thousand, eight hundred sixty-one".