8419991 has 4 divisors (see below), whose sum is σ = 8425800. Its totient is φ = 8414184.

The previous prime is 8419987. The next prime is 8419993. The reversal of 8419991 is 1999148.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 8419991 - 2² = 8419987 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 (8419993) 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, 1280 + ... + 4298.

It is an arithmetic number, because the mean of its divisors is an integer number (2106450).

Almost surely, 2^8419991 is an apocalyptic number.

8419991 is a deficient number, since it is larger than the sum of its proper divisors (5809).

8419991 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (8419990) it forms an eRAP, since the sums of their prime factors are consecutive (5807 and 5808).

8419991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5808.

The product of its digits is 23328, while the sum is 41.

The square root of 8419991 is about 2901.7220749066. The cubic root of 8419991 is about 203.4404037605.

The spelling of 8419991 in words is "eight million, four hundred nineteen thousand, nine hundred ninety-one".