8463991 has 4 divisors (see below), whose sum is σ = 8660872. Its totient is φ = 8267112.

The previous prime is 8463979. The next prime is 8464007. The reversal of 8463991 is 1993648.

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 8463991 - 2¹⁹ = 7939703 is a prime.

It is a Duffinian number.

8463991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8463391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98376 + ... + 98461.

It is an arithmetic number, because the mean of its divisors is an integer number (2165218).

Almost surely, 2^8463991 is an apocalyptic number.

8463991 is a deficient number, since it is larger than the sum of its proper divisors (196881).

8463991 is a wasteful number, since it uses less digits than its factorization.

8463991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196880.

The product of its digits is 46656, while the sum is 40.

The square root of 8463991 is about 2909.2939005883. The cubic root of 8463991 is about 203.7941583189.

It can be divided in two parts, 846399 and 1, that added together give a square (846400 = 920²).

The spelling of 8463991 in words is "eight million, four hundred sixty-three thousand, nine hundred ninety-one".