8399661 has 4 divisors (see below), whose sum is σ = 11199552. Its totient is φ = 5599772.

The previous prime is 8399659. The next prime is 8399687. The reversal of 8399661 is 1669938.

8399661 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8399661 - 2¹ = 8399659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8399621) 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, 1399941 + ... + 1399946.

It is an arithmetic number, because the mean of its divisors is an integer number (2799888).

Almost surely, 2^8399661 is an apocalyptic number.

It is an amenable number.

8399661 is a deficient number, since it is larger than the sum of its proper divisors (2799891).

8399661 is a wasteful number, since it uses less digits than its factorization.

8399661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2799890.

The product of its digits is 69984, while the sum is 42.

The square root of 8399661 is about 2898.2168655917. The cubic root of 8399661 is about 203.2765367360.

The spelling of 8399661 in words is "eight million, three hundred ninety-nine thousand, six hundred sixty-one".